Fix CLI --actions="..." confused by trailing semicolon
This patch adds a check for an empty, or white space only, action. If the action is empty or white space only, we simply continue the loop. The whitespace we account for is: * space (0x20, ' ') * form feed (0x0c, '\f') * line feed (0x0a, '\n') * carriage return (0x0d, '\r') * horizontal tab (0x09, '\t') * vertical tab (0x0b, '\v') Fixes #3480 (cherry picked from commit b571ec84)
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