Fix configuration of functor testing algorithms

The bad configuration was silently ignored (see
gaudi/Gaudi#163 and gaudi/Gaudi!1265 ) and as a result no
functors were built (into the cache) or tested.

Phys/FunctorCore/include/Functors/FunctorDesc.h

@@ -21,8 +21,6 @@
 #include <Gaudi/Parsers/Factory.h>
 
 namespace ThOr {
-  using parsing_type = std::tuple<std::string, std::vector<std::string>, std::string>;
-
   struct FunctorDesc {
     std::string              code{};
     std::vector<std::string> headers{};

Phys/FunctorCore/python/Functors/utils.py

@@ -24,6 +24,6 @@ def pack_dict(input_dict, wrap=None):
     if wrap is not None:
         input_dict = {k: wrap(v) for k, v in input_dict.items()}
     return {
-        k: [v.code(), v.code_repr()] + v.headers()
+        k: (v.code(), v.headers(), v.code_repr())
         for k, v in input_dict.items()
     }

Phys/SelAlgorithms/src/InstantiateFunctors.cpp

@@ -79,6 +79,7 @@ namespace {
 template <typename T>
 struct InstantiateFunctors final : public base_t<T> {
   using base_t<T>::base_t;
+  using base_t<T>::warning;
   using base_t<T>::info;
   using base_t<T>::debug;
   using base_t<T>::msgLevel;
@@ -93,6 +94,7 @@ struct InstantiateFunctors final : public base_t<T> {
       if ( cut ) { info() << "Cut return type is " << System::typeinfoName( cut.rtype() ) << endmsg; }
     }
     auto const& map = this->template getFunctorMap<Func<T>>();
+    if ( map.empty() ) { warning() << "Functor map is empty!" << endmsg; }
     for ( auto const& [nickname, func] : map ) {
       if ( func ) {
         info() << "Function " << nickname << " return type is " << System::typeinfoName( func.rtype() ) << endmsg;