Steps to reproduce:

1. Create a new project / open existing project
2. Add Xunit build step (Publish testing tools result report )
3. Ensure the Custom Tool option is selected
4. Uncheck Stop and set the build to 'failed' status if there are errors when processing a result file
5. Press save
6. Re-open configuration settings
7. Stop and set the build to 'failed' status if there are errors when processing a result file will still be enabled

Expected behaviour:
Stop and set the build to 'failed' status if there are errors when processing a result file is disabled

Solution: Add stopProcessingIfError to CustomType Constructor in com.thalesgroup.hudson.plugins.xunit.types.CustomType.java
IE:

@DataBoundConstructor
    @SuppressWarnings("unused")
    public CustomType(String pattern, String customXSL, boolean faildedIfNotNew, boolean deleteOutputFiles, boolean stopProcessingIfError) {
        super(pattern, faildedIfNotNew, deleteOutputFiles, stopProcessingIfError);
        this.customXSL = customXSL;
    }