fix: config fix not working outside dev environment

Author: ItsEmpa

src/main/kotlin/com/github/itsempa/nautilus/config/core/loader/ConfigMapper.kt

@@ -22,15 +22,14 @@ object ConfigMapper : DataMapper<Features> {
             val newJson = NautilusConfigMigrator.fixConfig(jsonObject)
 
             val run = { gson.fromJson<Features>(newJson) }
-            if (PlatformUtils.isDevEnvironment) {
+            return if (PlatformUtils.isDevEnvironment) {
                 try {
-                    return run()
+                    run()
                 } catch (e: Throwable) {
                     Nautilus.consoleLog(e.stackTraceToString())
                     McClient.shutdown("Nautilus Config is corrupt inside development environment.")
                 }
             } else run()
-            return gson.fromJson<Features>(string)
         }
     }
 }

src/main/kotlin/com/github/itsempa/nautilus/utils/helpers/McClient.kt

@@ -32,10 +32,12 @@ object McClient {
         else DelayedRun.runNextTick(action)
     }
 
-    fun shutdown(reason: String? = null) {
+    fun shutdown(reason: String? = null): Nothing {
         val reasonLine = reason?.let { " Reason: ($it)" }.orEmpty()
-        System.err.println("${Nautilus.MOD_NAME}-${Nautilus.VERSION} forced the game to shutdown.$reasonLine")
+        val message = "${Nautilus.MOD_NAME}-${Nautilus.VERSION} forced the game to shutdown.$reasonLine"
+        System.err.println(message)
         FMLCommonHandler.instance().handleExit(-1)
+        throw RuntimeException(message) // This is here so that shutdown can return "Nothing"
     }
 
 }