Added default value for source

Author: ProkopovVitaliy

src/com/magento/idea/magento2plugin/actions/generation/data/ProductEntityData.java

@@ -8,7 +8,7 @@ public class ProductEntityData implements EavEntityDataInterface {
     private String type;
     private String label;
     private String input;
-    private String source;
+    private String source = null;
     private String scope;
     private boolean isRequired = false;
     private boolean isUsedInGrid = false;

src/com/magento/idea/magento2plugin/actions/generation/generator/util/eav/ProductAttributeMapper.java

@@ -39,7 +39,7 @@ private Map<String, String> getMappedAttributes(ProductEntityData eavEntityData)
         mappedAttributes.put(EavAttributes.label.name(), wrapStringValueForTemplate(eavEntityData.getLabel()));
         mappedAttributes.put(EavAttributes.input.name(), wrapStringValueForTemplate(eavEntityData.getInput()));
 
-        mappedAttributes.put(EavAttributes.source.name(), wrapStringValueForTemplate(eavEntityData.getSource()));
+        mappedAttributes.put(EavAttributes.source.name(), eavEntityData.getSource());
         mappedAttributes.put(EavAttributes.required.name(), Boolean.toString(eavEntityData.isRequired()));
         mappedAttributes.put(EavAttributes.sort_order.name(), Integer.toString(eavEntityData.getSortOrder()));
         mappedAttributes.put(EavAttributes.global.name(), eavEntityData.getScope());