Issue when saving fusion

[matq007]

There is a problem when a fusion is in format GENEA--GENEB/GENEC. Missing escaping when saving a fusion.

Processing NFE2L1--SKAP1-AS1:  38%|███▊      | 56/149 [00:07<00:12,  7.38it/s][Errno 2] No such file or directory: './NFE2L1_THRA1/BTR.html'
Traceback (most recent call last):
  File "/fusionreport/lib/python3.7/site-packages/fusion_report/app.py", line 61, in run
    self.generate_report(params)
  File "/fusionreport/lib/python3.7/site-packages/fusion_report/app.py", line 124, in generate_report
    report.render(fusion_page)
  File "/fusionreport/lib/python3.7/site-packages/fusion_report/common/report.py", line 70, in render
    super().render(page, template_variables)
  File "/fusionreport/lib/python3.7/site-packages/fusion_report/common/template.py", line 47, in render
    os.path.join(self.output_dir, page.filename), 'w', encoding='utf-8'
FileNotFoundError: [Errno 2] No such file or directory: './NFE2L1_THRA1/BTR.html'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/fusionreport/bin/fusion_report", line 13, in <module>
    app.run()
  File "/fusionreport/lib/python3.7/site-packages/fusion_report/app.py", line 77, in run
    raise AppException(ex)
fusion_report.common.exceptions.app.AppException: [Errno 2] No such file or directory: './NFE2L1_THRA1/BTR.html'
[Errno 2] No such file or directory: './NFE2L1_THRA1/BTR.html'