fix(crash): gtnh integration returning null modid

now returns "gtnh" string that is comparable to another string.

build.gradle

@@ -24,7 +24,7 @@ apply plugin: 'forge'
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
-version = "1.7.10-1.11.0-gtnh"
+version = "1.7.10-1.11.1-gtnh"
 group= "com.jaquadro.minecraft.storagedrawers" // http://maven.apache.org/guides/mini/guide-naming-conventions.html
 archivesBaseName = "StorageDrawers"
 

src/com/jaquadro/minecraft/storagedrawers/integration/GTNHIntegrationModule.java

@@ -14,7 +14,7 @@ public class GTNHIntegrationModule extends IntegrationModule {
 
     @Override
     public String getModID() {
-        return null;
+        return "gtnh";
     }
 
     @Override