Pac tool on error must return non zero exit code.

[Fabian-Schmidt]

Describe the bug

I have an issue with my mapping file causing my pac solution unpack to crash.
But it returns no error code.

I am unsure what is my issue with the mapping file. BUT it was hidden and not early discovered because of this issue.

Unpacking Solution...
Reading mapping directives...
[...]
Mapping: C:\src\solution\pluginpackages\abc_abcPlugins\package\abc_abcPlugins.nupkg to
Microsoft PowerPlatform CLI
Version: 1.34.4+gbc3320d
Online documentation: https://aka.ms/PowerPlatformCLI
Feedback, Suggestions, Issues: https://github.com/microsoft/powerplatform-build-tools/discussions

Error: Value cannot be null.
Parameter name: key

PS C:\src> $LASTEXITCODE
0
PS C:\src> $?
True

To Reproduce

This specific mapping issue root cause is if you have multiple mappings and the pluginpackages mapping is not the first mapping.

Expected behavior

If ANY exception / error is occurring during pac tool the application return code must be non zero.

Desktop (please complete the following information):

• OS: Windows 10
• Version 10.0.19045.4780

Additional context
Add any other context about the problem here.