Fix validate assignment types for Quince

[DmytroAlipov]

This is a backport from the master branch.

Description

1. Possible save just space forAssignment type name
2. Possible save Number of droppable field with values more than the Total number value which leads to displaying errors all the time
3. Possible save Weight of total grade field with empty values:
   

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Implemented so that when an error occurs, the modal window containing the Save changes button is not displayed:

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Fixed display of errors for the Number of droppable field:

[openedx-webhooks]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (open-release/quince.master@9192287). Learn more about missing BASE report.

Additional details and impacted files

@@                      Coverage Diff                      @@
##             open-release/quince.master     #920   +/-   ##
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  Coverage                              ?   87.00%           
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  Files                                 ?      378           
  Lines                                 ?     5711           
  Branches                              ?     1265           
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  Hits                                  ?     4969           
  Misses                                ?      722           
  Partials                              ?       20           

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[mphilbrick211]

Hi @openedx/2u-tnl - this is ready for review. Thanks!

[DmytroAlipov]

Hi @mphilbrick211 exactly

[jesperhodge]

Great! I left a comment in the other ticket, if you do add any test you may want to copy it over to here, but that's not very important.

[mphilbrick211]

Hi @DmytroAlipov and @jesperhodge - just checking to see if this is all set?

[mphilbrick211]

Hi @jesperhodge! Are you able to merge this for us?

[KristinAoki]

There are some issues that still need to be resolved in the original PR before the backport can be merged.

[mphilbrick211]

There are some issues that still need to be resolved in the original PR before the backport can be merged.

The original has been closed - @KristinAoki do we still need this?

[KristinAoki]

@mphilbrick211 the orginal issue has been open in a new PR, #1059. The new PR is a draft so I think this PR can be closed and a new one open when #1059 is ready for review.