patches in rvm-1.0.5

- old
+ new

@@ -4,10 +4,10 @@
 # and dealing with patches.
 
 # Returns the path used to look for a patch given a specific name.
 __rvm_patch_lookup_path() {
   echo "/"
-  [[ -n "$rvm_patch_original_pwd" ]] && echo "$rvm_patch_original_pwd/"
+  [[ -n "${rvm_patch_original_pwd:-""}" ]] && echo "$rvm_patch_original_pwd/"
   echo "$PWD/"
   __rvm_ruby_string_paths_under "$rvm_patches_path" | sed 's/$/\//'
 }
 
 __rvm_expand_patch_name() {