Fixed Dict (cannot have empty elements)

common/include/Dict.hpp

@@ -30,10 +30,10 @@ class Dict
   private :
 
   void readFromFile(const char * filename);
+  void insert(const std::string & element);
 
   public :
 
-  void insert(const std::string & element);
   int getIndexOrInsert(const std::string & element);
   void setState(State state);
   State getState() const;

common/src/Dict.cpp

@@ -63,6 +63,9 @@ void Dict::insert(const std::string & element)
 
 int Dict::getIndexOrInsert(const std::string & element)
 {
+  if (element.empty())
+    return getIndexOrInsert(nullValueStr);
+
   const auto & found = elementsToIndexes.find(element);
 
   if (found == elementsToIndexes.end())