Catch ModdedConfig.getFilePath errors

This occurs when syncing the server config to the client. Ideally we'd
not hit this code path in the first place, but unfortunately there's no
way to tell where the config file comes from.

Fixes #2065

projects/forge/src/main/java/dan200/computercraft/ComputerCraft.java

@@ -57,6 +57,7 @@
 import net.neoforged.neoforge.registries.RegistryBuilder;
 
 import javax.annotation.Nullable;
+import java.nio.file.Path;
 
 @Mod(ComputerCraftAPI.MOD_ID)
 @EventBusSubscriber(modid = ComputerCraftAPI.MOD_ID, bus = EventBusSubscriber.Bus.MOD)
@@ -175,7 +176,13 @@ public static void sync(ModConfigEvent.Reloading event) {
     private static void syncConfig(ModConfig config) {
         if (!config.getModId().equals(ComputerCraftAPI.MOD_ID)) return;
 
-        var path = config.getFullPath();
+        Path path;
+        try {
+            path = config.getFullPath();
+        } catch (IllegalStateException ignored) {
+            path = null; // getFullPath throws if loading a non-valid file.
+        }
+
         if (config.getType() == ModConfig.Type.SERVER && ((ForgeConfigFile) ConfigSpec.serverSpec).spec().isLoaded()) {
             ConfigSpec.syncServer(path);
         } else if (config.getType() == ModConfig.Type.CLIENT) {