Enhance Error Handling

[ndonkoHenri]

• [x] Add more assertion checks on python end
• [x] Error messages on Dart end should be made more concise and clear
• [ ] ...

[base-13]

I faced this weird bug, in a DataTable if the number of columns is less than the number of datacells in any row it will grey out whole table without throwing error ( refer to the image attacted ) flet version: 0.22.0 OS: Windows 11

while if the number of columns is less than number of datacell in rows, it will just not display that cell and display rest of the table, I think this case can be also improved by throwing a warning at terminal about number of datacells being more than columns, or it should just render those cells without a column name.

[base-13]

I found another thing about DataTable, if you accidentally use any other control than DataCell inside of cells list in DataRow, it will grey out everything same as mentioned above.

[ndonkoHenri]

if you accidentally use any other control than DataCell inside of cells list in DataRow, it will grey out everything same as mentioned above.

What's the behavior you expected?

[base-13]

if you accidentally use any other control than DataCell inside of cells list in DataRow, it will grey out everything same as mentioned above.

What's the behavior you expected?

to throw a error stating that it was supposed to be a DataCell, not just greying out the whole table without any clue