Fixed a bug causing failure when user strings are empty.

src/data.rs

@@ -39,6 +39,7 @@ pub enum AccessLevel {
 
 impl AccessLevel {
     pub fn from_str(s: &str) -> AccessLevel {
+        if s.len() == 0 { Member } else {
             match s.char_at(0) {
                 '~' => Owner,
                 '&' => Admin,
@@ -48,6 +49,7 @@ impl AccessLevel {
                  _  => Member,
             }
         }
+    }
 }
 
 #[deriving(Show, PartialEq)]