Don't perform /f who for players without a faction

src/main/java/com/massivecraft/factions/cmd/CmdShow.java

@@ -42,6 +42,11 @@ public class CmdShow extends FCommand {
             }
         }
 
+        if (faction.isNone()) {
+            msg(TL.COMMAND_SHOW_NOFACTION);
+            return;
+        }
+
         // if economy is enabled, they're not on the bypass list, and this command has a cost set, make 'em pay
         if (!payForCommand(Conf.econCostShow, TL.COMMAND_SHOW_TOSHOW, TL.COMMAND_SHOW_FORSHOW)) {
             return;

src/main/java/com/massivecraft/factions/zcore/util/TL.java

@@ -343,6 +343,7 @@ public enum TL {
     COMMAND_SETHOME_SET("%s<i> set the home for your faction. You can now use:"),
     COMMAND_SETHOME_SETOTHER("<b>You have set the home for the %s<i> faction."),
 
+    COMMAND_SHOW_NOFACTION("You are not in a faction"),
     COMMAND_SHOW_TOSHOW("to show faction information"),
     COMMAND_SHOW_FORSHOW("for showing faction information"),
     COMMAND_SHOW_DESCRIPTION("<a>Description: <i>%s"),