Minor fixes for "matinfo --web-server"

libs/matdbg/web/script.js

@@ -159,6 +159,10 @@ function queryActiveShaders() {
         }
         renderMaterialList();
         renderMaterialDetail();
+    })
+    .catch((error) => {
+        // This is expected to fail when the server is hosted from matinfo instead of Engine, since
+        // there are no active shaders in that situation.
     });
 }
 

tools/matinfo/src/main.cpp

@@ -171,7 +171,7 @@ static int handleArguments(int argc, char* argv[], Config* config) {
                 config->shaderIndex = static_cast<uint64_t>(std::stoi(arg));
                 break;
             case 'w':
-                config->serverPort = 8080;
+                config->serverPort = std::stoi(arg);
                 break;
             case 'x':
                 config->printDictionaryGLSL = true;
@@ -386,6 +386,9 @@ static bool parseChunks(Config config, void* data, size_t size) {
     if (config.serverPort) {
         // Spin up a web server on a secondary thread.
         DebugServer server(Backend::DEFAULT, config.serverPort);
+        if (!server.isReady()) {
+            return false;
+        }
 
         // Notify the server that we have a filamat file.
         utils::CString name;