[Bug] :If no location is selected while saving a file the app crashes

[secretkontributer]

Avogadro version: (please complete the following information from the About box):

• Avogadrolibs: 1.99.0
• Qt: (e.g., 5.9.5)

Desktop version: (please complete the following information):

• OS: Ubuntu
• Version :23.10

Describe the bug
App carshes when you dont select the location in which you want to save the file .

To Reproduce
Steps to reproduce the behavior:

1. Go to save menu option .(You can recreate this bug with save as also)
   

2. Click on Save or Save As option . A window will pop up for selecting the location.

3.Now dont specify any location just exit from the screen shown in above picture.(Basically press the cancel button on the top left corner)

4. The App will crash .
5. Console output is given in the picture attached below.

Expected behavior
App should not crash

Additional context
Assert statement in the file location given in the console leads to this line.

[avo-bot]

This issue has been mentioned on Avogadro Discussion. There might be relevant details there:

https://discuss.avogadro.cc/t/if-not-selected-any-location-while-saving-the-file-the-app-carshes/5323/1

[welcome]

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