fix(doctrine): do not consider empty string as a current date (#7291)

Author: mbrodala

src/Doctrine/Common/Filter/DateFilterTrait.php

@@ -91,6 +91,14 @@ private function normalizeValue($value, string $operator): ?string
             return null;
         }
 
+        if ('' === $value) {
+            $this->getLogger()->notice('Invalid filter ignored', [
+                'exception' => new InvalidArgumentException(\sprintf('Invalid value for "[%s]", expected non-empty string', $operator)),
+            ]);
+
+            return null;
+        }
+
         return $value;
     }
 }