Add option to mjspec for creating a texture directly from a buffer.

PiperOrigin-RevId: 662186527
Change-Id: I469c876681d52964ac971c0bb2ec3517224d3a3d

src/xml/xml.cc

@@ -406,5 +406,11 @@ std::string WriteXML(const mjSpec* spec, char* error, int nerror) {
 
   mjXWriter writer;
   writer.SetModel(spec);
-  return writer.Write(error, nerror);
+
+  try {
+    return writer.Write(error, nerror);
+  } catch (mjXError err) {
+    mjCopyError(error, err.message, nerror);
+    return "";
+  }
 }