Fix #453 - catch bad objectlike type when analysing docblock

src/Psalm/Type.php

@@ -215,6 +215,10 @@ abstract class Type
                 throw new \InvalidArgumentException('Object-like type must be array');
             }
 
+            if (!$properties) {
+                throw new \InvalidArgumentException('No properties supplied for ObjectLike');
+            }
+
             return new ObjectLike($properties);
         }
 

tests/AnnotationTest.php

@@ -729,6 +729,14 @@ class AnnotationTest extends TestCase
                     }',
                 'error_message' => 'UndefinedClass',
             ],
+            'preventBadObjectLikeFormat' => [
+                '<?php
+                    /**
+                     * @param array{} $arr
+                     */
+                    function bar(array $arr): void {}',
+                'error_message' => 'InvalidDocblock',
+            ]
         ];
     }
 }