Fix "Could not create ITexture, texture needs to have a non-empty name" warning

src/client/tile.cpp

@@ -773,6 +773,9 @@ void TextureSource::rebuildImagesAndTextures()
 
 	// Recreate textures
 	for (TextureInfo &ti : m_textureinfo_cache) {
+		if (ti.name.empty())
+			continue; // Skip dummy entry
+
 		video::IImage *img = generateImage(ti.name);
 #if ENABLE_GLES
 		img = Align2Npot2(img, driver);