common/utils: Fix is_number("") to return FALSE

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Previously, it was possible to enter ‘ ’ (a space) at a number prompt,
and it would be stripped, passed to is_number() (which would erroneously
return TRUE), then passed to strtol() and the return value used
unconditionally.

Fix that by fixing is_number() to return FALSE for the empty string.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

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