Fixes #2804. The bug that was producing an exception error is fixed by checking if a network view has been created before sending the result as string. There was another complain regarding the help text. This should be fixed in next release 3.2. Finally, maybe it is not clear enough that string values for parameters need to be between quotes. This should be clearified in documentation.

Change-Id: I8848edc9a92a2075dffea422e288632238fe5e91