Improve messaging around filters

[sawilde]

Please provide the following information when submitting an issue, where appropriate replace the [ ] with a [X]

My Framework

• [ ] .NET 2
• [ ] .NET 3.5
• [X] .NET 4
• [ ] .NET 4.5
• [ ] .NET 4.6
• [ ] .NET 4.6.1
• [ ] .NET 4.6.2
• [ ] .NET Core 1.0.0
• [ ] Something else

My Environment

• [ ] Windows 7 or below (not truly supported due to EOL)
• [ ] Windows 8
• [ ] Windows 8.1
• [X] Windows 10
• [ ] Windows 10 IoT Core
• [ ] Windows Server 2012
• [ ] Windows Server 2012 R2
• [ ] Windows Server 2016

I have already...

• [X] repeated the problem using the latest stable release of OpenCover.
• [X] reviewed the usage guide and usage document.
• [X] have looked at the opencover output xml file in an attempt to resolve the issue.
• [X] reviewed the current issues to check that the issue isn't already known.

My issue is related to (check only those which apply):

• [X] no coverage being recorded
• [ ] 32 or 64 bit support
• [ ] feature request

Expected Behavior

Better reporting around which filter is in error

Actual Behavior

https://drdump.com/Problem.aspx?ProblemID=288604

Steps to reproduce the problem:

https://drdump.com/Problem.aspx?ProblemID=288604