cytoscape.vizmap.apply fails if 3.8.2 if no network is selected

[jorgeboucas]

In cytoscape 3.8.2 cytoscape.vizmap.apply(styles="default") does not work if no network is selected.

Cytoscape: 3.8.2

CyRest: v1

error:

apiVersion v1
cytoscapeVersion 3.8.2
<Response [500]> 500
b'{\n "data": {},\n "errors":[{"status":500,"type":"urn:cytoscape:ci:cyrest-core:v1:handle-json-command:errors:2","message":"No network views selected.","link":"file:/Users/jboucas/CytoscapeConfiguration/3/framework-cytoscape.log"}]\n}'
Traceback (most recent call last):
  File "/beegfs/group_bit/data/projects/departments/Bioinformatics/bit_Lena_rde1//cel/deseq2_output/PPIs.py", line 60, in <module>
    cytoscape.vizmap.apply(styles="default")
  File "/beegfs/group_bit/data/projects/departments/Constantinos_Demetriades/CD_Filipo_RR27/venv/lib/python3.8/site-packages/py2cytoscape/cyrest/vizmap.py", line 38, in apply
    response=api(url=self.__url+"/apply", PARAMS=PARAMS, method="POST", verbose=verbose)
  File "/beegfs/group_bit/data/projects/departments/Constantinos_Demetriades/CD_Filipo_RR27/venv/lib/python3.8/site-packages/py2cytoscape/cyrest/base.py", line 150, in api
    raise ValueError(res["errors"][0])
ValueError: {'status': 500, 'type': 'urn:cytoscape:ci:cyrest-core:v1:handle-json-command:errors:2', 'message': 'No network views selected.', 'link': 'file:/Users/jboucas/CytoscapeConfiguration/3/framework-cytoscape.log'}

Maybe also worth for @bdemchak and @AlexanderPico to take a look