Bugfix/#1631 multi file input validierung bei upload abbruch

[lehju]

Description

Fix multi file input validation

Reference

Issues: #1631

Check-List

• No waste on Branch left (e.g. console.logs)
• Board is up-to-date

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.73%. Comparing base (6f7c1ae) to head (45abc19).
Report is 2 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##                dev    #1732   +/-   ##
=========================================
  Coverage     44.73%   44.73%           
  Complexity     1706     1706           
=========================================
  Files           653      653           
  Lines          9629     9629           
  Branches        477      477           
=========================================
  Hits           4308     4308           
  Misses         5139     5139           
  Partials        182      182           

Flag	Coverage Δ
unittests	44.73% <ø> (ø)

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