attempt to fix failure when loading broken addons

report errors when unable to parse addons interface
add message when some addons failed, suggest solution to the user
(merge https://trac.osgeo.org/grass/changeset/64499, https://trac.osgeo.org/grass/changeset/64504, https://trac.osgeo.org/grass/changeset/64532 from trunk)


git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@64628 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/core/toolboxes.py

@@ -504,6 +504,7 @@ def _expandRuntimeModules(node):
     >>> etree.tostring(tree)
     '<items><module-item name="m.proj"><module>m.proj</module><description>Converts coordinates from one projection to another (cs2cs frontend).</description><keywords>miscellaneous,projection</keywords></module-item></items>'
     """
+    hasErrors = False
     modules = node.findall('.//module-item')
     for module in modules:
         name = module.get('name')
@@ -517,8 +518,13 @@ def _expandRuntimeModules(node):
             n.text = _escapeXML(desc)
             n = etree.SubElement(parent=module, tag='keywords')
             n.text = _escapeXML(','.join(keywords))
-
-
+            if not desc:
+                hasErrors = True
+    
+    if hasErrors:
+        sys.stderr.write(_("WARNING: Some addons failed when loading. "
+                           "Please consider to update your addons by running 'g.extension.all -f'.\n"))
+    
 def _escapeXML(text):
     """Helper function for correct escaping characters for XML.
 
@@ -539,7 +545,8 @@ def _loadMetadata(module):
     """
     try:
         task = gtask.parse_interface(module)
-    except ScriptError:
+    except (ScriptError, UnicodeDecodeError) as e:
+        sys.stderr.write("%s: %s\n" % (module, e))
         return '', ''
 
     return task.get_description(full=True), \