ci: coverage: remove --ignore-errors

This should not be necessary (anymore).

.travis.yml

@@ -103,8 +103,8 @@ after_success:
       # Add last TOXENV to $PATH.
       PATH="$PWD/.tox/${TOXENV##*,}/bin:$PATH"
       coverage combine
-      coverage xml --ignore-errors
-      coverage report -m --ignore-errors
+      coverage xml
+      coverage report -m
       bash <(curl -s https://codecov.io/bash) -Z -X gcov -X coveragepy -X search -X xcode -X gcovout -X fix -f coverage.xml -F $TRAVIS_OS_NAME
     fi
 

scripts/upload-coverage.bat

@@ -8,8 +8,8 @@ if "%PYTEST_COVERAGE%" == "1" (
     )
     python -m pip install codecov
     coverage combine
-    coverage xml --ignore-errors
-    coverage report -m --ignore-errors
+    coverage xml
+    coverage report -m
     scripts\retry codecov --required -X gcov pycov search -f coverage.xml --flags windows
 ) else (
     echo Skipping coverage upload, PYTEST_COVERAGE=%PYTEST_COVERAGE%