misc: fix |first & |last with LazyFormData value (#69539)

tests/backoffice_pages/test_all.py

@@ -2767,7 +2767,7 @@ def test_backoffice_sidebar_lateral_block(pub):
     assert partial_resp.text == '<div class="lateral-block">XXbouhXX</div>'
 
     # error in lateral template
-    formdef.lateral_template = 'XX{{ form|first }}XX'
+    formdef.lateral_template = 'XX{% for %}XX'
     formdef.store()
 
     pub.loggederror_class.wipe()
@@ -2776,7 +2776,7 @@ def test_backoffice_sidebar_lateral_block(pub):
     assert pub.loggederror_class.count() == 1
     assert (
         pub.loggederror_class.select()[0].summary
-        == "Could not render lateral template ('LazyFormData' object has no attribute '0')"
+        == "Could not render lateral template (syntax error in Django template: 'for' statements should have at least four words: for)"
     )
 
 

tests/test_templates.py

@@ -1279,19 +1279,31 @@ def test_is_empty():
 
 
 def test_first():
+    class MockFormData:
+        formdef = None
+
+    lazy_formdata = LazyFormData(MockFormData())
+
     tmpl = Template('{{ foo|first }}')
     assert tmpl.render({'foo': ['foo']}) == 'foo'
     assert tmpl.render({'foo': 'foo'}) == 'f'
     assert tmpl.render({'foo': ''}) == ''
     assert tmpl.render({'foo': None}) == ''
+    assert tmpl.render({'foo': lazy_formdata}) == ''
 
 
 def test_last():
+    class MockFormData:
+        formdef = None
+
+    lazy_formdata = LazyFormData(MockFormData())
+
     tmpl = Template('{{ foo|last }}')
     assert tmpl.render({'foo': ['foo']}) == 'foo'
     assert tmpl.render({'foo': 'foo'}) == 'o'
     assert tmpl.render({'foo': ''}) == ''
     assert tmpl.render({'foo': None}) == ''
+    assert tmpl.render({'foo': lazy_formdata}) == ''
 
 
 def test_convert_as_list():

wcs/qommon/templatetags/qommon.py

@@ -959,7 +959,7 @@ def rename_file(value, new_name):
 def first(value):
     try:
         return defaultfilters.first(value)
-    except TypeError:
+    except (TypeError, AttributeError):
         return ''
 
 
@@ -967,7 +967,7 @@ def first(value):
 def last(value):
     try:
         return defaultfilters.last(value)
-    except TypeError:
+    except (TypeError, AttributeError):
         return ''