Fix PHP warnings when building an incomplete CASE expression

Issue can be reproduced with the following code snippet:
```php
new \PhpMyAdmin\SqlParser\Parser('SELECT a CASE');
// PHP Warning:  count(): Parameter must be an array or an object that implements Countable in src/Components/CaseExpression.php on line 296
// PHP Warning:  count(): Parameter must be an array or an object that implements Countable in src/Components/CaseExpression.php on line 297
```

19 files changed, 26 insertions, 20 deletions

diff --git a/src/Components/CaseExpression.php b/src/Components/CaseExpression.php
index a79b52e..309f0ff 100644
--- a/src/Components/CaseExpression.php
+++ b/src/Components/CaseExpression.php
@@ -33,21 +33,21 @@ class CaseExpression extends Component
      *
      * @var array
      */
-    public $conditions;
+    public $conditions = [];
 
     /**
      * The results matching with the WHEN clauses.
      *
      * @var array
      */
-    public $results;
+    public $results = [];
 
     /**
      * The values to be compared against.
      *
      * @var array
      */
-    public $compare_values;
+    public $compare_values = [];
 
     /**
      * The result in ELSE section of expr.
diff --git a/tests/Components/CaseExpressionTest.php b/tests/Components/CaseExpressionTest.php
index cb9290c..2ea8f8b 100644
--- a/tests/Components/CaseExpressionTest.php
+++ b/tests/Components/CaseExpressionTest.php
@@ -118,4 +118,10 @@ class CaseExpressionTest extends TestCase
             'CASE WHEN 1=1 THEN "Some" WHEN 1=2 THEN "SomeOther" END AS `foo`'
         );
     }
+
+    public function testBuildWithIncompleteCaseExpression()
+    {
+        $incomplete_case_expression_component = new CaseExpression();
+        $this->assertEquals('CASE END', CaseExpression::build($incomplete_case_expression_component));
+    }
 }
diff --git a/tests/data/parser/parseSelectCase1.out b/tests/data/parser/parseSelectCase1.out
index 287dbdd..3bfc877 100644
--- a/tests/data/parser/parseSelectCase1.out
+++ b/tests/data/parser/parseSelectCase1.out
@@ -1,4 +1,4 @@
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diff --git a/tests/data/parser/parseSelectCase2.out b/tests/data/parser/parseSelectCase2.out
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diff --git a/tests/data/parser/parseSelectCase4.out b/tests/data/parser/parseSelectCase4.out
index 4958a83..f60c049 100644
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diff --git a/tests/data/parser/parseSelectCaseAlias1.out b/tests/data/parser/parseSelectCaseAlias1.out
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diff --git a/tests/data/parser/parseSelectCaseAlias2.out b/tests/data/parser/parseSelectCaseAlias2.out
index bffcaad..f2990a3 100644
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diff --git a/tests/data/parser/parseSelectCaseAlias5.out b/tests/data/parser/parseSelectCaseAlias5.out
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diff --git a/tests/data/parser/parseSelectCaseAlias6.out b/tests/data/parser/parseSelectCaseAlias6.out
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diff --git a/tests/data/parser/parseSelectCaseAliasErr1.out b/tests/data/parser/parseSelectCaseAliasErr1.out
index 5d66c6f..454fe1c 100644
--- a/tests/data/parser/parseSelectCaseAliasErr1.out
+++ b/tests/data/parser/parseSelectCaseAliasErr1.out
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diff --git a/tests/data/parser/parseSelectCaseAliasErr2.out b/tests/data/parser/parseSelectCaseAliasErr2.out
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diff --git a/tests/data/parser/parseSelectCaseAliasErr3.out b/tests/data/parser/parseSelectCaseAliasErr3.out
index 827abfd..7a575d1 100644
--- a/tests/data/parser/parseSelectCaseAliasErr3.out
+++ b/tests/data/parser/parseSelectCaseAliasErr3.out
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diff --git a/tests/data/parser/parseSelectCaseAliasErr4.out b/tests/data/parser/parseSelectCaseAliasErr4.out
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diff --git a/tests/data/parser/parseSelectCaseErr1.out b/tests/data/parser/parseSelectCaseErr1.out
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--- a/tests/data/parser/parseSelectCaseErr1.out
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diff --git a/tests/data/parser/parseSelectCaseErr2.out b/tests/data/parser/parseSelectCaseErr2.out
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diff --git a/tests/data/parser/parseSelectCaseErr3.out b/tests/data/parser/parseSelectCaseErr3.out
index a863e95..8f618c8 100644
--- a/tests/data/parser/parseSelectCaseErr3.out
+++ b/tests/data/parser/parseSelectCaseErr3.out
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diff --git a/tests/data/parser/parseSelectCaseErr4.out b/tests/data/parser/parseSelectCaseErr4.out
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diff --git a/tests/data/parser/parseSelectCaseErr5.out b/tests/data/parser/parseSelectCaseErr5.out
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