Export-NUnitXml.psm1 fails when no line # is found

[jasonrush]

Expected Behavior

If no line number is found, an empty string should probably be used, instead of the script failing.

Current Behavior

If Invoke-ScriptAnalyzer returns an error where no line number is indicated, PowerShell throws a Runtime exception.

Possible Solution

Steps to Reproduce (for bugs)

Apparently I had a file that has non-ASCII characters in it. I run $ScriptAnalyzerResult = Invoke-ScriptAnalyzer -Path '.\MyProject\' -Recurse -ErrorAction SilentlyContinue and it returns a warning for the RuleName PSUseBOMForUnicodeEncodedFile, but no line number is indicated. This is subsequently passed through to Export-NUnitXml.psm1 which proceeds to throw a RuntimeException as it is not able to call $Result.Line.ToString() on $null.

Context

I am trying to integrate this into appveyor, along with some other stuff (like Pester testing) for a PowerShell module I'm trying to write, and this is causing me issues while trying to figure out if my appveyor settings are right or not (won't successfully complete, so I can't tell if it's showing all the individual error lines or not).

Your Environment

Not sure this is relevant as the issue is the module assumes a line # is returned, but a line # is not always returned. Feel free to reach out to me if you do need more details.

Additional info

RuleName                            Severity     ScriptName Line  Message                                                     
--------                            --------     ---------- ----  -------                                                     
PSAvoidTrailingWhitespace           Information  Invoke-aaa 74    Line has trailing whitespace                                
                                                 aaaaaaaaaa                                                                   
                                                 .ps1                                                                         
PSUseBOMForUnicodeEncodedFile       Warning      Invoke-aaa       Missing BOM encoding for non-ASCII encoded file             
                                                 aaaaaaaaaa       'Invoke-aaaaaaaaaaaaa.ps1'                                  
                                                 .ps1                                                                         
PSAvoidTrailingWhitespace           Information  Get-aaaaaa 55    Line has trailing whitespace                                
                                                 a.ps1                                                                        
PSAvoidTrailingWhitespace           Information  Get-aaaaaa 50    Line has trailing whitespace                                
                                                 aaaaaa.ps1                                                                   
You cannot call a method on a null-valued expression.
At C:\windows\system32\Export-NUnitXml.psm1:74 char:111
+ ... f $TestDescription, $($Result.ScriptName), $($Result.Line.ToString())
+                                                  ~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull