model: use `Map::get_or_null` for `get_x_by_name`

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/src/model/model.nit b/src/model/model.nit
index 677ac69..d27c429 100644 (file)
--- a/src/model/model.nit
+++ b/src/model/model.nit
@@ -74,11 +74,7 @@ redef class Model
        # Visibility or modules are not considered
        fun get_mclasses_by_name(name: String): nullable Array[MClass]
        do
-               if mclasses_by_name.has_key(name) then
-                       return mclasses_by_name[name]
-               else
-                       return null
-               end
+               return mclasses_by_name.get_or_null(name)
        end
 
        # Collections of properties grouped by their short name
@@ -92,11 +88,7 @@ redef class Model
        # Visibility or modules are not considered
        fun get_mproperties_by_name(name: String): nullable Array[MProperty]
        do
-               if not mproperties_by_name.has_key(name) then
-                       return null
-               else
-                       return mproperties_by_name[name]
-               end
+               return mproperties_by_name.get_or_null(name)
        end
 
        # The only null type