Do not allow NONE/NO_VALUE for locals of custom frame

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/PythonCextBuiltins.java

@@ -1491,7 +1491,13 @@ long getHash() {
     abstract static class PyTruffleFrameNewNode extends PythonBuiltinNode {
         @Specialization
         Object newFrame(Object threadState, PCode code, PythonObject globals, Object locals) {
-            return factory().createPFrame(threadState, code, globals, locals);
+            Object frameLocals;
+            if (locals == null || PGuards.isPNone(locals)) {
+                frameLocals = factory().createDict();
+            } else {
+                frameLocals = locals;
+            }
+            return factory().createPFrame(threadState, code, globals, frameLocals);
         }
     }