Fail pattern match when JSON path not found

[lundberg]

Fixes #182

[codecov-commenter]

Codecov Report

Merging #184 (7e30b0b) into master (586c91f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #184   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           20        20           
  Lines         2715      2714    -1     
  Branches       290       288    -2     
=========================================
- Hits          2715      2714    -1     

Impacted Files	Coverage Δ
respx/patterns.py	100.00% <100.00%> (ø)
tests/test_patterns.py	100.00% <100.00%> (ø)

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