Fix lost exception in Extension Telemetry code

[larohra]

Description

Issue #

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PR information

• The title of the PR is clear and informative.
• There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• Except for special cases involving multiple contributors, the PR is started from a fork of the main repository, not a branch.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made and Travis.CI is passing.

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

[codecov]

Codecov Report

Merging #1983 into develop will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1983   +/-   ##
========================================
  Coverage    71.14%   71.15%           
========================================
  Files           86       86           
  Lines        12285    12285           
  Branches      1728     1729    +1     
========================================
+ Hits          8740     8741    +1     
  Misses        3159     3159           
+ Partials       386      385    -1     

Impacted Files	Coverage Δ
azurelinuxagent/ga/extension_telemetry.py	91.90% <100.00%> (+0.47%)	⬆️

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