[202205][FlexCounters] Fixed orchagent crash issue#2395 #2939
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Issue seen on platforms that are not supporting queue-watermark and pg counters.
What I did
Cherry-pick fix for orchagent crash reported in #2935
Why I did it
Added checks to skip if max values for PG and queue are 0
How I verified it
Reloaded swss debian with fix and enable flex counters watermark and pg-drop
Details if related