Error on creating account

[marija04]

What was the feature/problem?

When you try to create a new account with the username that already exist in the database we get error "Request failed with status code 500".

How does this PR address the above feature/problem?

This is fixed now and we get the following error "Username already exist"

Check lists (check x in [ ] of list items)

• [ ] Test passed
• [ ] Coding style (indentation, etc)

Additional Comments (if any)

{Please write here}

[codecov-commenter]

Codecov Report

Merging #154 into master will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #154      +/-   ##
==========================================
+ Coverage   94.33%   94.37%   +0.03%     
==========================================
  Files          29       29              
  Lines         459      462       +3     
  Branches       52       53       +1     
==========================================
+ Hits          433      436       +3     
  Misses         23       23              
  Partials        3        3              

Flag	Coverage Δ
#api	97.23% <100.00%> (+0.04%)	:arrow_up:
#ui	92.52% <ø> (ø)

Impacted Files	Coverage Δ
ui/src/login/ValidatedSignUpForm.js	100.00% <ø> (ø)
api/src/routes/auth.js	100.00% <100.00%> (ø)

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