Gson isn't broken, I'm broken

src/main/java/link/infra/packwiz/installer/Main.java

@@ -122,7 +122,13 @@ public class Main {
 			ui.executeManager(new Runnable(){
 				@Override
 				public void run() {
-					new UpdateManager(uOptions, ui);
+					try {
+						new UpdateManager(uOptions, ui);
+					} catch (Exception e) {
+						// TODO: better error message?
+						ui.handleExceptionAndExit(e);
+						return;
+					}
 				}
 			});
 		} catch (Exception e) {

src/main/java/link/infra/packwiz/installer/UpdateManager.java

@@ -140,7 +140,7 @@ public class UpdateManager {
 			return;
 		}
 
-		if (packFileSource.hashIsEqual(manifest.packFileHash)) {
+		if (manifest.packFileHash != null && packFileSource.hashIsEqual(manifest.packFileHash)) {
 			System.out.println("Hash already up to date!");
 			// WOOO it's already up to date
 			// todo: --force?