Log the correct error and don't log an error at all if a default icon…

… doesn't exist (Closes #208)

- Fixed incorrect error being logged when a mod defines an invalid icon
- Fixed an error being logged when no icon is at the default path

src/main/java/com/terraformersmc/modmenu/util/mod/ModIconHandler.java

@@ -1,7 +1,5 @@
 package com.terraformersmc.modmenu.util.mod;
 
-import com.terraformersmc.modmenu.ModMenu;
-import net.fabricmc.loader.api.FabricLoader;
 import net.fabricmc.loader.api.ModContainer;
 import net.minecraft.client.texture.NativeImage;
 import net.minecraft.client.texture.NativeImageBackedTexture;
@@ -24,10 +22,6 @@ public class ModIconHandler {
 	public NativeImageBackedTexture createIcon(ModContainer iconSource, String iconPath) {
 		try {
 			Path path = iconSource.getPath(iconPath);
-			if (!Files.exists(path)) {
-				iconSource = FabricLoader.getInstance().getModContainer(ModMenu.MOD_ID).orElseThrow(() -> new RuntimeException("Cannot get ModContainer for Mod Menu!"));
-				iconPath = "assets/" + ModMenu.MOD_ID + "/unknown_icon.png";
-			}
 			NativeImageBackedTexture cachedIcon = getCachedModIcon(path);
 			if (cachedIcon != null) {
 				return cachedIcon;
@@ -45,7 +39,9 @@ public NativeImageBackedTexture createIcon(ModContainer iconSource, String iconP
 			}
 
 		} catch (Throwable t) {
-			LOGGER.error("Invalid mod icon for icon source {}: {}", iconSource.getMetadata().getId(), iconPath, t);
+			if (!iconPath.equals("assets/" + iconSource.getMetadata().getId() + "/icon.png")) {
+				LOGGER.error("Invalid mod icon for icon source {}: {}", iconSource.getMetadata().getId(), iconPath, t);
+			}
 			return null;
 		}
 	}