tab completion now fails gracefully if command is not registered (cannot block completions that are not registered)

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>eu.endermite</groupId>
     <artifactId>CommandWhitelist</artifactId>
-    <version>1.5.1</version>
+    <version>1.5.2</version>
     <packaging>jar</packaging>
 
     <name>CommandWhitelist</name>

src/main/java/eu/endermite/commandwhitelist/spigot/listeners/TabCompleteBlockerListener.java

@@ -25,7 +25,9 @@ public class TabCompleteBlockerListener implements Listener {
             if (cmd.startsWith("/" + scommand + " ")) {
                 continue;
             }
+            try {
                 suggestions.remove(slast);
+            } catch (Exception ignored) {}
         }
         event.setCompletions(suggestions);
     }