match in rvm-1.0.3

- old
+ new

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-if [[ -z "$1" ]] || [[ -z "$2" ]] ; then exit 1 ; fi
+if [[ -z "${1:-""}" ]] || [[ -z "${2:-""}" ]] ; then exit 1 ; fi
 
-if [[ -n "$(echo "$1" |  awk "/${2}/")" ]] ; then exit 0 ; else exit 1 ; fi
+if [[ -n "$(echo "${1}" |  awk "/${2}/")" ]] ; then exit 0 ; else exit 1 ; fi
 