[PATCH 2 of 6] Doc

[Wald Commits]

# HG changeset patch
# User Felix Wolfsteller <felix.wolfsteller at intevation.de>
# Date 1373449070 -7200
# Node ID 12d9c5a430c57a2fa16db808e8a31015bda4bfa3
# Parent  e89e5163973f6ac3b7f8f35b0d84478953ff12f6
Doc.

diff -r e89e5163973f -r 12d9c5a430c5 artifacts/src/main/java/org/dive4elements/river/artifacts/states/WaterlevelState.java
--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/states/WaterlevelState.java	Wed Jul 10 11:37:00 2013 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/states/WaterlevelState.java	Wed Jul 10 11:37:50 2013 +0200
@@ -138,6 +138,7 @@
         return res;
     }
 
+    /** Returns empty String if argument is null, argument itself otherwise. */
     private static final String nn(String s) {
         return s != null ? s : "";
     }