Unhelpful error message when app and consumer keys have not been configured

[make-github-pseudonymous-again]

/usr/bin/ovh-dns: line 104: [: No: integer expression expected
parse error: Invalid numeric literal at line 1, column 12
/usr/bin/ovh-dns: line 120: [: -gt: unary operator expected
parse error: Invalid numeric literal at line 1, column 12
/usr/bin/ovh-dns: line 135: [: -eq: unary operator expected
parse error: Invalid numeric literal at line 1, column 12
/usr/bin/ovh-dns: line 145: [: No: integer expression expected
parse error: Invalid numeric literal at line 1, column 12