Avoid exception when using ResourceIdentifierObjectSerializer with unexisting primary key

[sliverc]

Fixes #683

Description of the Change

Because of star import linting didn't realize that ObjectDoesNotExist exception was not properly imported.

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[codecov]

Codecov Report

Merging #690 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #690      +/-   ##
==========================================
+ Coverage   95.96%   95.97%   +0.01%     
==========================================
  Files          54       54              
  Lines        2727     2735       +8     
==========================================
+ Hits         2617     2625       +8     
  Misses        110      110

Impacted Files	Coverage Δ
example/tests/test_serializers.py	100% <100%> (ø)	⬆️

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@1fa7deb). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #690   +/-   ##
=========================================
  Coverage          ?   95.97%           
=========================================
  Files             ?       54           
  Lines             ?     2735           
  Branches          ?        0           
=========================================
  Hits              ?     2625           
  Misses            ?      110           
  Partials          ?        0

Impacted Files	Coverage Δ
example/tests/test_serializers.py	100% <100%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1fa7deb...83dd124. Read the comment docs.

[sliverc]

@n2ygk Could you have a look at this PR? Thanks.

[n2ygk]

@n2ygk Could you have a look at this PR? Thanks.

@sliverc Will do. Sometimes I miss these assignment emails because I subscribe to all activity. I'll make a tickler to regularly check https://github.com/pulls/review-requested

[n2ygk]

Yes, looks good. Sorry for the delay in reviewing this.