emersion / emersion/mrsh

command builtin without arguments crashes

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C
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Description

Running a built-in utility without arguments using `command`, e.g. `command pwd` or `command alias`, crashes mrsh with the following error message:
```
mrsh: builtin/builtin.c:104: mrsh_run_builtin: Assertion `argc > 0' failed.
Aborted (core dumped)
```

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