Fix: Revert coremongo panic fix.

1. Fix: Revert coremongo panic fix as its breaking existing sls functionality. Need to check for empty arrays instead of empty string in existing code.

dalmdl/coremongo/coremongo.go

@@ -380,10 +380,11 @@ func (mg *MongoDAO) GetProjectedData(selector map[string]interface{}, projector
 		}
 		results = append(results, result)
 	}
-	if len(results) == 0 {
-		rs := gjson.Parse(`[]`)
-		return &rs, nil
-	}
+	// this fix is breaking existing sls functionality, need to review and change accrodingly.
+	// if len(results) == 0 {
+	// 	rs := gjson.Parse(`[]`)
+	// 	return &rs, nil
+	// }
 	ba, marshalError := json.Marshal(results)
 	if errormdl.CheckErr2(marshalError) != nil {
 		return nil, errormdl.CheckErr2(marshalError)