Improvement of cyclomatic complexity by fewer nestings.

OpenRA.Game/GameRules/Ruleset.cs

@@ -260,8 +260,9 @@ namespace OpenRA
 				return true;
 
 			// Any trait overrides that aren't explicitly whitelisted are flagged
-			if (mapRules != null)
-			{
+			if (mapRules == null)
+				return false;
+
 			if (AnyFlaggedTraits(modData, mapRules.Nodes))
 				return true;
 
@@ -272,7 +273,6 @@ namespace OpenRA
 					if (AnyFlaggedTraits(modData, MiniYaml.FromStream(fileSystem.Open(f), f)))
 						return true;
 			}
-			}
 
 			return false;
 		}