[Entity] fix empty name and type handling in create_new

Author: jgrewe

nixio/entity.py

@@ -21,11 +21,13 @@ def __init__(self, nixfile, nixparent, h5group):
     @classmethod
     def create_new(cls, nixfile, nixparent, h5parent, name=None, type_=None):
         if name and type_:
-            util.check_entity_name_and_type(name, type_)
             id_ = util.create_id()
-        else:
+            util.check_entity_name_and_type(name, type_)
+        if not name:
             name = util.create_id()
             id_ = name
+            util.check_entity_type(type_)
+
         h5group = h5parent.open_group(name)
         h5group.set_attr("name", name)
         h5group.set_attr("type", type_)

nixio/test/test_file.py

@@ -63,6 +63,13 @@ def test_file_blocks(self):
 
         assert len(self.file.blocks) == 0
 
+        with self.assertRaises(ValueError):
+            self.file.create_block()
+            self.file.create_block(name="a name")
+        
+        b = self.file.create_block(type_="type_a")
+        assert(b.id == b.name)
+
     def test_file_sections(self):
         assert len(self.file.sections) == 0