tools: Do not append an empty list (pim_vrfs) to the config lines #16425
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If pim_vrfs is empty, we append [] into the lines array, and the reload is broken
since it expects only strings, but gets an array inside at the end.
```
Traceback (most recent call last):
File "/usr/lib/frr/frr-reload.py", line 2227, in <module>
log.debug("New Frr Config\n%s", newconf.get_lines())
File "/usr/lib/frr/frr-reload.py", line 436, in get_lines
return "\n".join(self.lines)
TypeError: sequence item 45: expected str instance, list found
```
Fixes: 98d47f4 ("tools: Fix frr-reload to support legacy pim configuration from file")
Signed-off-by: Donatas Abraitis <[email protected]>
Signed-off-by: Donatas Abraitis <[email protected]>
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