Fix MappingMatcher in case of an exception in LinqMatcher.

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #322 into master will decrease coverage by 0.17%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master     #322      +/-   ##
==========================================
- Coverage   79.94%   79.77%   -0.18%     
==========================================
  Files         110      111       +1     
  Lines        4379     4400      +21     
==========================================
+ Hits         3501     3510       +9     
- Misses        878      890      +12

Impacted Files	Coverage Δ
src/WireMock.Net/Matchers/XPathMatcher.cs	89.28% <ø> (ø)	⬆️
src/WireMock.Net/Owin/MappingMatcherResult.cs	100% <100%> (ø)
src/WireMock.Net/Matchers/LinqMatcher.cs	83.33% <62.5%> (-16.67%)	⬇️
src/WireMock.Net/Owin/MappingMatcher.cs	88.23% <85%> (-11.77%)	⬇️
src/WireMock.Net/Owin/WireMockMiddleware.cs	94.44% <85.71%> (ø)	⬆️

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[codecov]

Codecov Report

Merging #322 into master will decrease coverage by 0.17%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master     #322      +/-   ##
==========================================
- Coverage   79.94%   79.77%   -0.18%     
==========================================
  Files         110      111       +1     
  Lines        4379     4400      +21     
==========================================
+ Hits         3501     3510       +9     
- Misses        878      890      +12

Impacted Files	Coverage Δ
src/WireMock.Net/Matchers/XPathMatcher.cs	89.28% <ø> (ø)	⬆️
src/WireMock.Net/Owin/MappingMatcherResult.cs	100% <100%> (ø)
src/WireMock.Net/Matchers/LinqMatcher.cs	83.33% <62.5%> (-16.67%)	⬇️
src/WireMock.Net/Owin/MappingMatcher.cs	88.23% <85%> (-11.77%)	⬇️
src/WireMock.Net/Owin/WireMockMiddleware.cs	94.44% <85.71%> (ø)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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