Fix option to modify form expiration date

Author: Defective4

src/main/java/net/discordjug/javabot/systems/staff_commands/forms/commands/ModifyFormSubcommand.java

@@ -43,7 +43,7 @@ public ModifyFormSubcommand(FormsRepository formsRepo, BotConfig botConfig) {
 				new OptionData(OptionType.STRING, "submit-message",
 						"Message displayed to the user once they submit the form"),
 				new OptionData(OptionType.STRING, "expiration",
-						"UTC time after which the form stops accepting submissions. - for no expiration"
+						"UTC time after which the form stops accepting submissions. - for no expiration. "
 								+ FormInteractionManager.DATE_FORMAT_STRING),
 				new OptionData(OptionType.BOOLEAN, "onetime",
 						"If the form should only accept one submission per user. Defaults to false.")));
@@ -67,15 +67,18 @@ public void execute(SlashCommandInteractionEvent event) {
 		if (event.getOption("expiration") == null) {
 			expiration = oldForm.expiration();
 		} else {
-			if ("-".equals(event.getOption("expiration", OptionMapping::getAsString))) expiration = null;
-			Optional<Instant> expirationOpt;
-			try {
-				expirationOpt = FormInteractionManager.parseExpiration(event);
-			} catch (IllegalArgumentException e) {
-				event.getHook().sendMessage(e.getMessage()).queue();
-				return;
+			if ("-".equals(event.getOption("expiration", OptionMapping::getAsString))) {
+				expiration = null;
+			} else {
+				Optional<Instant> expirationOpt;
+				try {
+					expirationOpt = FormInteractionManager.parseExpiration(event);
+				} catch (IllegalArgumentException e) {
+					event.getHook().sendMessage(e.getMessage()).queue();
+					return;
+				}
+				expiration = expirationOpt.orElse(oldForm.expiration());
 			}
-			expiration = expirationOpt.orElse(oldForm.expiration());
 		}
 
 		boolean onetime = event.getOption("onetime", oldForm.onetime(), OptionMapping::getAsBoolean);