tony/tmuxp — pull request #76 by ThiefMaster (2014-04-01 19:54:47+00:00)
Title: don't require shell_command

Right now this fails:

```
panes:
- focus: true
```

while this works:

```
panes:
- focus: true
shell_command:
```

or this:

```
panes:
-
```

It would be nice if `shell_command` defaulted to empty even if other keys were present for the pane.