Invert if-statement to reduce nesting

Relates to #20

ATxCommon/StorageStatus.cs

@@ -185,15 +185,15 @@ namespace ATxCommon
             }
             _lastUpdateGraceLocation = DateTime.Now;
 
-            if (_expiredDirs.Count > 0) {
-                var detailCount = 0;
-                foreach (var toplevel in _expiredDirs.Keys) {
-                    detailCount += _expiredDirs[toplevel].Count;
-                }
-                Log.Debug("Updated storage status: {0} top-level directories with a total of " +
-                          "{1} expired sub-directories in grace location.",
-                    _expiredDirs.Count, detailCount);
+            if (_expiredDirs.Count == 0)
+                return;
+
+            var detailCount = 0;
+            foreach (var toplevel in _expiredDirs.Keys) {
+                detailCount += _expiredDirs[toplevel].Count;
             }
+            Log.Debug("Updated grace location status: {0} top-level directories with a total of " +
+                      "{1} expired sub-directories found.", _expiredDirs.Count, detailCount);
         }
 
         /// <summary>