Don't add empty elements to vector.

src/cgi.cpp

@@ -99,9 +99,12 @@ vector<string> string_to_vector(const string_view str)
     string element;
 
     while (getline(input, element, ','))
+    {
+        if (!element.empty())
         {
             vec.push_back(element);
         }
+    }
 
     return vec;
 }