Removed the null descriptions from the string representation of the option groups

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/cli/trunk@1073925 13f79535-47bb-0310-9956-ffa450edef68

Author: ebourg

src/main/java/org/apache/commons/cli/OptionGroup.java

@@ -159,10 +159,13 @@ public String toString()
                 buff.append("--");
                 buff.append(option.getLongOpt());
             }
-
-            buff.append(" ");
-            buff.append(option.getDescription());
-
+            
+            if (option.getDescription() != null)
+            {
+                buff.append(" ");
+                buff.append(option.getDescription());
+            }
+            
             if (iter.hasNext())
             {
                 buff.append(", ");