FIX: check if the filament is unknown

jira: [STUDIO-12085]
Change-Id: Ibf40d7a5106a40385aff5c769e5b7e5cdb866de0
(cherry picked from commit 012b6f2395d66b7b1bdafa3e851ca4b2f874eb23)

src/slic3r/GUI/Widgets/AMSItem.cpp

@@ -178,6 +178,21 @@ void AMSinfo::parse_ext_info(MachineObject* obj, AmsTray tray) {
     this->cans.push_back(info);
 }
 
+Caninfo AMSinfo::get_caninfo(const std::string& can_id, bool& found) const
+{
+    found = false;
+    for (const auto& can_info : cans)
+    {
+        if (can_info.can_id == can_id)
+        {
+            found = true;
+            return can_info;
+        }
+    }
+
+    return Caninfo();
+};
+
 /*************************************************
 Description:AMSExtText
 **************************************************/