Remove unnecessary "throws" declarations

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201058582

java/google/registry/tools/CreateCreditBalanceCommand.java

@@ -56,7 +56,7 @@ final class CreateCreditBalanceCommand extends MutatingCommand {
   private DateTime effectiveTime;
 
   @Override
-  public void init() throws Exception {
+  public void init() {
     Registrar registrar =
         checkArgumentPresent(
             Registrar.loadByClientId(clientId), "Registrar %s not found", clientId);