fix phpstan

Author: joelwurtz

src/Generator/IdentifierHashGenerator.php

@@ -52,6 +52,10 @@ public function getStatements(GeneratorMetadata $metadata, bool $fromSource): ar
 
         // foreach property we check
         foreach ($identifiers as $property) {
+            if (null === $property->source->accessor || null === $property->target->readAccessor) {
+                continue;
+            }
+
             // check if the source is defined
             if ($fromSource) {
                 if ($property->source->checkExists) {
@@ -81,6 +85,10 @@ public function getStatements(GeneratorMetadata $metadata, bool $fromSource): ar
             }
         }
 
+        if (count($statements) < 2) {
+            return [];
+        }
+
         // return hash as string
         $statements[] = new Stmt\Return_(new Expr\FuncCall(new Name('hash_final'), [
             new Arg($hashCtxVariable),