Removing a number in a cell does not remove the time entry

[HenrikeW]

Describe the bug

In a cell that contains a time entry from a database, this time entry is not removed if the user only removes the number with Backspace or Delete and saves. He/she instead has to type a 0 into the cell and save to effectively remove the entry from the database.
In technical terms, the newTimeEntries array that keeps track of changes in the frontend code, isn't updated in this case.
This only is a problem with entries from the database. The cell behavior for so far unsaved entries works as expected.

Steps to reproduce

1. Go to the report page to a week that already has entries from the database.
2. Click into a cell with entry and remove the number with Backspace or delete
3. Click "Save changes" - you should get the warning that you don't have any changes to save. That's the bug.

To reproduce the correct behavior when pressing 0:

1. Repeat steps 1 and 2 from above.
2. Type 0 in the cell
3. Click "Save changes"
4. Reload the page - the entry should be gone

To reproduce the correct behavior for unsaved entries:

1. Go to the report page
2. Click in an empty cell and enter a number
3. Remove the number again with Backspace or Delete
4. Click "Save changes" - you should get the warning that you don't have any changes to save.

Environment

develop branch

Expected behavior

• if a time entry from the database in a cell is removed with Backspace or Delete, this should be recognized as a change and delete the entry from the database when pressing "Save changes"

Screenshots

Additional context

[kusalananda]

The behaviour seems slightly different from what's described in the first scenario. When clicking "Save changes" in the 3rd step, I get the error dialogue box saying I have no changes to save.

[HenrikeW]

Yes, of course, you're right Andreas! I updated the description.