Fix fetching stocks with null values in price array

[marvinruder]

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[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
✅ +0.00% (target: +0.00%)	✅ ∅ (target: 100.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (51780dc)	10939	10939	100.00%
Head commit (708321a)	10939 (+0)	10939 (+0)	100.00% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1319)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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