Don’t throw exception when property is missing type

src/Psalm/Type.php

@@ -354,8 +354,8 @@ abstract class Type
                     $property_maybe_undefined = $property_branch->possibly_undefined;
                     $property_key = $property_branch->value;
                 } else {
-                    throw new \InvalidArgumentException(
-                        'Unexpected number of property parts (' . count($property_branch->children) . ')'
+                    throw new TypeParseTreeException(
+                        'Missing property type'
                     );
                 }
 

tests/AnnotationTest.php

@@ -1195,6 +1195,13 @@ class AnnotationTest extends TestCase
                     $a = $_GET["foo"];',
                 'error_message' => 'UndefinedClass',
             ],
+            'badPsalmType' => [
+                '<?php
+                    /**
+                     * @psalm-type Foo = array{a:}
+                     */',
+                'error_message' => 'InvalidDocblock',
+            ],
         ];
     }
 }