Fix issues as reported by bandit or mark as nosec

Nothing worrying, but good to have checked this regardless
and important to have a green pipeline.

Fix #175

projects/forms.py

@@ -3,6 +3,7 @@ from django.contrib.auth import get_user_model
 from django.template.defaultfilters import yesno
 from django.urls import reverse
 
+from bugsink.utils import assert_
 from teams.models import TeamMembership
 
 from .models import Project, ProjectMembership, ProjectRole
@@ -40,7 +41,7 @@ class MyProjectMembershipForm(forms.ModelForm):
     def __init__(self, *args, **kwargs):
         edit_role = kwargs.pop("edit_role")
         super().__init__(*args, **kwargs)
-        assert self.instance is not None, "This form is only implemented for editing"
+        assert_(self.instance is not None, "This form is only implemented for editing")
 
         if not edit_role:
             del self.fields['role']