Fix bug with dependent extensions with no settings (#2285)

[nagworld9]

(cherry picked from commit b6a0624)

[codecov]

Codecov Report

Merging #2362 (23f3b8b) into develop (9339e88) will increase coverage by 0.02%.
The diff coverage is 75.00%.

@@             Coverage Diff             @@
##           develop    #2362      +/-   ##
===========================================
+ Coverage    70.89%   70.91%   +0.02%     
===========================================
  Files           97       97              
  Lines        14093    14096       +3     
  Branches      2029     2030       +1     
===========================================
+ Hits          9991     9996       +5     
- Misses        3653     3654       +1     
+ Partials       449      446       -3     

Impacted Files	Coverage Δ
azurelinuxagent/ga/exthandlers.py	86.25% <75.00%> (+0.03%)	⬆️
azurelinuxagent/common/event.py	85.29% <0.00%> (-0.68%)	⬇️
azurelinuxagent/ga/collect_telemetry_events.py	91.43% <0.00%> (+1.71%)	⬆️

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