notify the user from server ui that multimodality is unavialable

examples/server/public/index.html

@@ -406,6 +406,10 @@
         } else {
           currentMessages.push(data);
           slot_id = data.slot_id;
+          if(selected_image && !data.multimodal) {
+            alert("The server was no compiled for multimodal or the model projector can't be loaded.");
+            return;
+          }
           transcriptUpdate([...history, [char, currentMessages]])
         }
 
@@ -524,7 +528,7 @@
           </div>
           <div class="right">
             <button type="submit" disabled=${generating.value}>Send</button>
-            <button onclick=${uploadImage} style="margin-left: 10px;margin-right: 10px;">Upload Image</button>
+            <button onclick=${uploadImage}>Upload Image</button>
             <button onclick=${stop} disabled=${!generating.value}>Stop</button>
             <button onclick=${reset}>Reset</button>
           </div>

examples/server/server.cpp

@@ -1669,7 +1669,12 @@ static json format_partial_response(
     json res = json{
         {"content", content },
         {"stop", false},
-        { "slot_id", slot->id }
+        { "slot_id", slot->id },
+#ifdef SERVER_MULTIMODAL_SUPPORT
+        {"multimodal", llama.multimodal }
+#else
+        {"multimodal", false }
+#endif
     };
 
     if (slot->sparams.n_probs > 0)