Fixed #381: 'tink workflow state' command returns an error if workflow does not exist

[parauliya]

Signed-off-by: parauliya [email protected]

Description

Now tink workflow state <wfid> command will return an error if the workflow with id wfid does not exist.

Why is this needed

Fixes: #381

How Has This Been Tested?

Tested with Vagrant setup.

How are existing users impacted? What migration steps/scripts do we need?

No Impact on existing users.

Checklist:

I have:

• updated the documentation and/or roadmap (if required)
• added unit or e2e tests
• provided instructions on how to upgrade

[codecov]

Codecov Report

Merging #447 (71b2662) into master (5e1f0fd) will increase coverage by 0.67%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master     #447      +/-   ##
==========================================
+ Coverage   35.14%   35.82%   +0.67%     
==========================================
  Files          47       47              
  Lines        2888     2892       +4     
==========================================
+ Hits         1015     1036      +21     
+ Misses       1781     1763      -18     
- Partials       92       93       +1     

Impacted Files	Coverage Δ
db/workflow.go	29.09% <0.00%> (-0.12%)	⬇️
grpc-server/workflow.go	39.78% <100.00%> (+10.98%)	⬆️

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[parauliya]

This PR will fix the issue #381 but there are few more similar issue which I found will be pushed in the same PR and then this will be marked as Ready for Review.