Fix #2297: Enable branch coverage

[troydai]

No description provided.

[codecov-io]

Codecov Report

Merging #2317 into master will decrease coverage by -4.5%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #2317     +/-   ##
=========================================
- Coverage   77.56%   73.07%   -4.5%     
=========================================
  Files         457      457             
  Lines       19447    19447             
  Branches        0     2739   +2739     
=========================================
- Hits        15084    14210    -874     
+ Misses       4363     4304     -59     
- Partials        0      933    +933

Impacted Files	Coverage Δ
...i-iot/azure/cli/command_modules/iot/_validators.py	55.55% <0%> (-22.23%)	❌
...evice/lib/operations/iot_hub_devices_operations.py	60.51% <0%> (-21.89%)	❌
...i-acr/azure/cli/command_modules/acr/_validators.py	57.89% <0%> (-21.06%)	❌
src/azure-cli-core/azure/cli/core/_environment.py	60% <0%> (-20%)	❌
.../network/mgmt_nic/lib/operations/nic_operations.py	64.81% <0%> (-16.67%)	❌
...gmt_app_gateway/lib/app_gateway_creation_client.py	70.27% <0%> (-16.22%)	❌
...ules/network/mgmt_vnet/lib/vnet_creation_client.py	70.27% <0%> (-16.22%)	❌
...odules/network/mgmt_nic/lib/nic_creation_client.py	70.27% <0%> (-16.22%)	❌
..._modules/network/mgmt_lb/lib/lb_creation_client.py	70.27% <0%> (-16.22%)	❌
...nd_modules/acs/mgmt_acs/lib/acs_creation_client.py	70.27% <0%> (-16.22%)	❌
... and 97 more

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