Direction molecules: Now we include reference point, consider it when test if molecules found

intelligine/simulation/molecule/DirectionMolecule.py

@@ -24,7 +24,8 @@ class DirectionMolecule():
         around_molecules_points = cls._get_around_molecules(context, point, molecule_type,
                                                             molecule_filter=around_molecule_filter)
 
-        if not around_molecules_points:
+        if not around_molecules_points \
+           or (len(around_molecules_points) == 1 and around_molecules_points[0][0] == point):
             raise NoMolecule()
 
         shuffle(around_molecules_points)
@@ -74,7 +75,8 @@ class DirectionMolecule():
             except NoMolecule:
                 pass  # Ok, no molecule, continue to sniff around
 
-        if not around_molecules_points:
+        if not around_molecules_points \
+           or (len(around_molecules_points) == 1 and around_molecules_points[0][0] == reference_point):
             raise NoMolecule()
 
         shuffle(around_molecules_points)