only override django for FIPS in environments where Django is installed

isolated awx installs don't have this tooling, and so they don't need
this specific monkey-patch

awx/__init__.py

@@ -22,22 +22,28 @@ except ImportError: # pragma: no cover
 
 
 import hashlib
-import django
+
-from django.utils.encoding import force_bytes
+try:
-from django.db.backends.base.schema import BaseDatabaseSchemaEditor
+    import django
-from django.db.backends.base import schema
+    from django.utils.encoding import force_bytes
+    from django.db.backends.base.schema import BaseDatabaseSchemaEditor
+    from django.db.backends.base import schema
+    HAS_DJANGO = True
+except ImportError:
+    HAS_DJANGO = False
 
 
-# This line exists to make sure we don't regress on FIPS support if we
+if HAS_DJANGO is True:
-# upgrade Django; if you're upgrading Django and see this error,
+    # This line exists to make sure we don't regress on FIPS support if we
-# update the version check below, and confirm that FIPS still works.
+    # upgrade Django; if you're upgrading Django and see this error,
-if django.__version__ != '1.11.16':
+    # update the version check below, and confirm that FIPS still works.
+    if django.__version__ != '1.11.16':
         raise RuntimeError("Django version other than 1.11.16 detected {}. \
                 Subclassing BaseDatabaseSchemaEditor is known to work for Django 1.11.16 \
                 and may not work in newer Django versions.".format(django.__version__))
 
 
-class FipsBaseDatabaseSchemaEditor(BaseDatabaseSchemaEditor):
+    class FipsBaseDatabaseSchemaEditor(BaseDatabaseSchemaEditor):
 
         @classmethod
         def _digest(cls, *args):
@@ -54,7 +60,7 @@ class FipsBaseDatabaseSchemaEditor(BaseDatabaseSchemaEditor):
             return h.hexdigest()[:8]
 
 
-schema.BaseDatabaseSchemaEditor = FipsBaseDatabaseSchemaEditor
+    schema.BaseDatabaseSchemaEditor = FipsBaseDatabaseSchemaEditor
 
 
 def find_commands(management_dir):