fix(MgtProfile): Fix handling of null values for educations & work positions

[chaelli]

Closes #2713

PR Type

• Bugfix

Description of the changes

Added some null/undefined handling to not show invalid data:
Old:

New:

this is for a case where an education has no programm displayName and startdate. It also fixes the issue when the startdate ist 0001-01-01 which is obviously also invalid.
It also removes the ',' when no state or no city is given in a work position.

PR checklist

• Project builds (yarn build) and changes have been tested in at least two supported browsers (Edge + non-Chromium based browser)
• Stories have been added and existing stories have been tested
• Contains NO breaking changes

[microsoft-github-policy-service]

Thank you for creating a Pull Request @chaelli.

This is a checklist for the PR reviewer(s) to complete before approving and merging this PR:

• I have verified a documentation PR has been linked and is approved (or not applicable)
• I have ran this PR locally and have tested the fix/feature
• I have verified that stories have been added to storybook (or not applicable)
• I have tested existing stories in storybook to verify no regression has occured
• I have tested the solution in at least two browsers (Edge + 1 non-Chromium based browser)

[gavinbarron]

Thanks for this PR @chaelli
There's a few small changes I'd like for this to get merged

[chaelli]

@microsoft-github-policy-service agree

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[gavinbarron]

Great stuff, thank you @chaelli