PMD fix

Change-Id: Ief34fb1ecf4f5e393fb839f2100b8492e26155a9
Reviewed-on: http://gerrit.dmdirc.com/1745
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>

src/com/dmdirc/parser/irc/ServerInfo.java

@@ -299,10 +299,12 @@ public class ServerInfo {
         if (uri.getRawQuery() != null && !uri.getRawQuery().isEmpty()) {
             channelString += "?" + uri.getRawQuery();
         }
+
         if (uri.getRawFragment() != null && !uri.getRawFragment().isEmpty()) {
             channelString += "#" + uri.getRawFragment();
         }
-        if (channelString.startsWith("/")) {
+
+        if (!channelString.isEmpty() && channelString.charAt(0) == '/') {
             channelString = channelString.substring(1);
         }