ZeroDivisionError no coverage captured

[edcote]

Traceback (most recent call last):                                                                                   
  File "/google/src/cloud/ecote/rdo1/google3/third_party/fc4sc/tools/coverage_report/report.py", line 210, in <module>                                                                                                                     
    d = parser.get_report_data(args.xml_report)                                                                                                                                                                                            
  File "/google/src/cloud/ecote/rdo1/google3/third_party/fc4sc/tools/coverage_report/report.py", line 29, in get_report_data                                                                                                               
    self.get_covergroup_report_data(covergroupCoverage, module_data)                                                                                                                                                                       
  File "/google/src/cloud/ecote/rdo1/google3/third_party/fc4sc/tools/coverage_report/report.py", line 51, in get_covergroup_report_data                                                                                                    
    cg_data['pct_cov'] = sum([cp['pct_cov'] * cp['weight'] for cp in cg_data['inst_data'].values()]) \                                                                                                                                     
ZeroDivisionError: float division by zero                                                                                                                                                                                                  

cg_inst['inst_data'] could contain elements