[SWSS]: Allow system with no ports in config db run without errors#4

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liorghub wants to merge 3 commits intomasterfrom

Commits on May 14, 2021

[fabricportsorch] Add fabric support (#1459)
ngoc-do
authored

Commits on May 17, 2021

[fix] Use the same storm detection condition for queue occupancy non-zero case as the zero case (#1111)

wendani
authored and
qiluo-msft
committed

Commits on May 18, 2021

Add support for system without ports
liorghub
committed