refs #13698 - Library: avoid lookup of empty stings [skip ci]

Author: firewave

lib/library.cpp

@@ -1324,6 +1324,8 @@ const Library::Container* Library::detectContainerInternal(const Token* const ty
 {
     if (!typeStart)
         return nullptr;
+    if (typeStart->str().empty())
+        return nullptr;
     const Token* firstLinkedTok = nullptr;
     for (const Token* tok = typeStart; tok && !tok->varId(); tok = tok->next()) {
         if (!tok->link())
@@ -1894,6 +1896,8 @@ const Library::SmartPointer* Library::detectSmartPointer(const Token* tok, bool
         typestr += tok->str();
         tok = tok->next();
     }
+    if (typestr.empty())
+        return nullptr;
     auto it = mData->mSmartPointers.find(typestr);
     if (it == mData->mSmartPointers.end())
         return nullptr;