Fix Compare-BapEnvironmentD365App function to handle missing source v…

[FH-Inway]

…ersions

[Splaxi]

I'm not sure this PR is needed:

Per the begin section, we are only fetching installed Apps from the source environment.

d365bap.tools/d365bap.tools/functions/Compare-BapEnvironmentD365App.ps1

Line 109 in dddd163

$appsSourceEnvironment = Get-BapEnvironmentD365App -EnvironmentId $SourceEnvironmentId -InstallState Installed -GeoRegion $GeoRegion

But if your testing shows, that we need this change/PR - then please go ahead and merge 👍

[FH-Inway]

@Splaxi The issue occurred indeed with one of the environments I have access to. We may need to revisit this sometime and handle packages with a "N/A" version differently. But for now, this should do it.