fixes #65 issue when expanding list of multiple relations

[m29h]

This adds both a integration test case for multiple relation expansion as well as resolves #65

we did not handle the case where the expansion is a list of records instead of a single record directly

Note: this only pushes the uncertainty down to the next layer. Now the value of expand["xxx"] can either be

• not present in the map expand at all if there is no relation
• a value of type Record if there actually is a single relation (even if pocketbase theoretically allows to set more than one relation)
• a value of type List[Record] if there are actually two or more relations

[coveralls]

Pull Request Test Coverage Report for Build 5814928105

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 92.042%

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Totals
Change from base Build 5290254865:	0.1%
Covered Lines:	801
Relevant Lines:	843

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💛 - Coveralls

[kbruegge]

So this seems to work. It now returns a list of records. Which for me is absolutely fine.

In [7]: r.expand
Out[7]: {'location': [<Record: 0yoeep2hyh0p57t>]}

Thanks!

[Cobryis]

@vaphes Are you planning on integrating this fix?