Better exception for bad URL parse

[ahopkins]

Fixes #2394

[codecov]

Codecov Report

Merging #2415 (54c55f6) into main (0309874) will increase coverage by 0.015%.
The diff coverage is 100.000%.

@@              Coverage Diff              @@
##              main     #2415       +/-   ##
=============================================
+ Coverage   87.226%   87.242%   +0.015%     
=============================================
  Files           60        60               
  Lines         5034      5040        +6     
  Branches       907       907               
=============================================
+ Hits          4391      4397        +6     
  Misses         472       472               
  Partials       171       171               

Impacted Files	Coverage Δ
sanic/exceptions.py	98.837% <100.000%> (+0.027%)	⬆️
sanic/request.py	96.231% <100.000%> (+0.044%)	⬆️

---

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 0309874...54c55f6. Read the comment docs.