fix: add null-check for Minecraft options

- Fixes #119

common/src/main/java/eu/midnightdust/blur/config/BlurConfig.java

@@ -53,6 +53,7 @@ public class BlurConfig extends MidnightConfig {
     @Override
     public void writeChanges(String modid) {
         super.writeChanges(modid);
+        if (MinecraftClient.getInstance().options != null)
             MinecraftClient.getInstance().options.getMenuBackgroundBlurriness().setValue(radius);
     }
 

gradle.properties

@@ -8,7 +8,7 @@ yarn_mappings=1.21.4+build.1
 enabled_platforms=fabric,neoforge
 
 # Mod Properties
-mod_version=5.1.2
+mod_version=5.1.3
 maven_group=eu.midnightdust.blur
 archives_base_name=blur
 release_type=release