Consider file encoding for modules in reconfigure

If the modules are not in utf8 then we warn and skip that file
like it happens for layout files.

This a port of commit a8094051c1 to stable.

lib/configure.py

@@ -1584,9 +1584,17 @@ def checkModulesConfig():
           continue
 
       seen.append(filename)
+      try:
           retval = processModuleFile(file, filename, bool_docbook)
           if retval:
               tx.write(retval)
+      except UnicodeDecodeError:
+          logger.warning("**************************************************\n"
+                         "Module file '%s'\n"
+                         "cannot be decoded in utf-8.\n"
+                         "Please check if the file has the correct encoding.\n"
+                         "Skipping this file!\n"
+                         "**************************************************" % filename)
   tx.close()
   logger.info('\tdone')
 

status.23x

@@ -114,3 +114,7 @@ What's new
 
 - Wininstaller, fix bug where previous installations, with emergency version
   greater than 1, could not be seen in registry on overinstall
+
+- Do not break configuration if a module file is not decodable (file
+  not encoded in utf-8). Rather than that, issue a warning and skip
+  that file (a variant of bug 11736).