Prevent panic in case url.Parsing fails in fasthttp and fiber

[ribice]

Resolves #911

If r.URL is not set due to some error, setting r.URL.RawQuery panics. Panic is recovered, but request is never converted thus causing another panic.

[codecov]

Codecov Report

Attention: Patch coverage is 88.46154% with 3 lines in your changes missing coverage. Please review.

Project coverage is 83.16%. Comparing base (9ed1fa9) to head (b084369).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
fiber/sentryfiber.go	80.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #912      +/-   ##
==========================================
- Coverage   83.21%   83.16%   -0.05%     
==========================================
  Files          55       55              
  Lines        5897     5899       +2     
==========================================
- Hits         4907     4906       -1     
- Misses        820      822       +2     
- Partials      170      171       +1     

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