Uncaught exception when RETURN pressed in a DataTable with no rows

[pkazmier]

Uncaught exception CellDoesNotExist causes the application to crash if a user presses RETURN in a DataTable that has focus but no rows.

The sample app below demonstrates this behavior. Run it and press RETURN to cause the crash.

from textual.app import App, ComposeResult
from textual.widgets import DataTable


class Demo(App):
    def compose(self) -> ComposeResult:
        yield DataTable()

    def on_mount(self):
        self.set_focus(self.query_one(DataTable))


if __name__ == "__main__":
    Demo().run()

Output of textual diagnose below:

# Textual Diagnostics

## Versions

| Name    | Value  |
|---------|--------|
| Textual | 0.13.0 |
| Rich    | 13.3.1 |

## Python

| Name           | Value                                |
|----------------|--------------------------------------|
| Version        | 3.9.13                               |
| Implementation | CPython                              |
| Compiler       | Clang 13.1.6 (clang-1316.0.21.2)     |
| Executable     | /Users/kaz/tmp/textual/bin/python3.9 |

## Operating System

| Name    | Value                                                                                           |
|---------|-------------------------------------------------------------------------------------------------|
| System  | Darwin                                                                                          |
| Release | 22.3.0                                                                                          |
| Version | Darwin Kernel Version 22.3.0: Mon Jan 30 20:42:11 PST 2023; root:xnu-8792.81.3~2/RELEASE_X86_64 |

## Terminal

| Name                 | Value           |
|----------------------|-----------------|
| Terminal Application | tmux (next-3.4) |
| TERM                 | tmux-256color   |
| COLORTERM            | truecolor       |
| FORCE_COLOR          | *Not set*       |
| NO_COLOR             | *Not set*       |

## Rich Console options

| Name           | Value                |
|----------------|----------------------|
| size           | width=263, height=69 |
| legacy_windows | False                |
| min_width      | 1                    |
| max_width      | 263                  |
| is_terminal    | True                 |
| encoding       | utf-8                |
| max_height     | 69                   |
| justify        | None                 |
| overflow       | None                 |
| no_wrap        | False                |
| highlight      | None                 |
| markup         | None                 |
| height         | None                 |

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[pkazmier]

Closing as this was resolved in #1973.

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