Fix backward compatibility (#296)

Author: ArnaudBuchholz

src/define/class/import.js

@@ -7,6 +7,7 @@
 /*global _GpfClassDefinition*/ // Class definition
 /*global _gpfDefineEntitiesAdd*/ // Store the entity definition to be retreived later
 /*global _gpfDefineEntitiesFindByConstructor*/ // Retrieve entity definition from Constructor
+/*global _gpfEmptyFunc*/
 /*exported _gpfDefineClassImport*/ // Import a class as an entity definition
 /*exported _gpfDefineClassImported*/ // Base dictionary for all imported classes
 /*#endif*/
@@ -25,6 +26,9 @@ function _gpfDefineClassImportFrom (instanceBuilder) {
     var entityDefinition = new _GpfClassDefinition(_gpfDefineClassImportGetDictionary(instanceBuilder));
     entityDefinition._instanceBuilder = instanceBuilder;
     _gpfDefineEntitiesAdd(entityDefinition);
+    // Since it might not even have a name
+    entityDefinition._checkNameIsNotEmpty = _gpfEmptyFunc;
+    entityDefinition._checkName = _gpfEmptyFunc;
     entityDefinition.check();
     return entityDefinition;
 }