[1.7.x] Fixed #23525 -- Fixed admindocs crash on apps installed as eggs.

Thanks welbornprod for report and initial patch.

Backport of 01ab84c613 from master

django/contrib/admindocs/views.py

@@ -309,6 +309,10 @@ def load_all_installed_template_libraries():
     # Load/register all template tag libraries from installed apps.
     for module_name in template.get_templatetags_modules():
         mod = import_module(module_name)
+        if not hasattr(mod, '__file__'):
+            # e.g. packages installed as eggs
+            continue
+
         try:
             libraries = [
                 os.path.splitext(p)[0]
@@ -316,7 +320,8 @@ def load_all_installed_template_libraries():
                 if p.endswith('.py') and p[0].isalpha()
             ]
         except OSError:
-            libraries = []
+            continue
+        else:
             for library_name in libraries:
                 try:
                     template.get_library(library_name)

docs/releases/1.7.2.txt

@@ -160,3 +160,5 @@ Bugfixes
   a crash when the index name requires it (:ticket:`#24015`).
 
 * Added ``datetime.time`` support to migrations questioner (:ticket:`23998`).
+
+* Fixed admindocs crash on apps installed as eggs (:ticket:`23525`).