Fixed blank lines in banned words file issues.

Blank lines resulted in lots of chat being muted which shouldn't have
been.

src/me/ryanhamshire/GriefPrevention/WordFinder.java

@@ -14,9 +14,12 @@ class WordFinder
         
         StringBuilder patternBuilder = new StringBuilder();
         for(String word : wordsToFind)
+        {
+            if(!word.isEmpty() && !word.trim().isEmpty())
             {
                 patternBuilder.append("|(([^\\w]|^)" + Pattern.quote(word) + "([^\\w]|$))");
             }
+        }
         
         String patternString = patternBuilder.toString();
         if(patternString.length() > 1)