execute the pgsqlcmd with LANG=C to make sure the output is in english and we can match for '(0 rows)' in the next task

[johanneskastl]

If the LANG variable is set to anything other than english, it might be that the output does not contain (0 rows), but contains e.g. (0 Zeilen) instead (in a German settting).

Prefixing the psqslcmd with LANG=C makes sure the output is always english...

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[johanneskastl]

Signed the CLA

[bobapple]

@cla-bot check

[mkayontour]

Thanks for the PR, this looks good.