增加saveMdlData 和 loadMdlData 供模板保存时使用

gjjs-bd-runtime/src/main/java/com/brilliance/mda/runtime/mda/impl/DatafieldImpl.java

@@ -4,6 +4,7 @@ import com.brilliance.mda.runtime.mda.FieldHolder;
 import com.brilliance.mda.runtime.mda.IDatafield;
 import com.brilliance.mda.runtime.mda.IModule;
 import com.brilliance.mda.runtime.mda.driver.MdaDriver;
+import com.brilliance.mda.runtime.mda.util.MdaUtils;
 
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
@@ -51,7 +52,7 @@ public class DatafieldImpl<T> implements IDatafield<T> {
 			}
 		}
 		else{
-			String prefix = parent.getPath();
+			String prefix = !MdaUtils.isEmpty(parent)?parent.getPath():"";
 			if(prefix == null || prefix.length() ==0)
 				this.path = this.name;
 			else