[202012] [ecnconfig] Fix exception seen during display and add unit tests#1789

Merged

qiluo-msft merged 1 commit intosonic-net:202012from neethajohn:ecnq_fix_202012

Sep 2, 2021

+880-17

Commits on Aug 30, 2021

[ecnconfig] Fix exception seen during display and add unit tests (sonic-net#1784 )
neethajohn
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