Use new Match::or to simplify return

ignore/src/lib.rs

@@ -297,4 +297,13 @@ impl<T> Match<T> {
             Match::Whitelist(t) => Match::Whitelist(f(t)),
         }
     }
+
+    /// Return the match if it is not none. Otherwise, return other.
+    pub fn or(self, other: Self) -> Self {
+        if self.is_none() {
+            other
+        } else {
+            self
+        }
+    }
 }