Fix intermittent installation/update failures

Add exception handling for addon and settings initialization during
installation/update when addon may not be fully registered yet:
- Wrap __addon__ and __pluginpath__ initialization in try/except
- Handle settings access failures in LogHandler.__init__()
- Protect formatException() and _gen_rel_path() from missing __pluginpath__

resources/lib/loghandler.py

@@ -12,8 +12,13 @@ from kodi_six import xbmc, xbmcaddon
 
 from .utils import translate_path
 
-__addon__ = xbmcaddon.Addon(id='plugin.video.jellycon')
-__pluginpath__ = translate_path(__addon__.getAddonInfo('path'))
+try:
+    __addon__ = xbmcaddon.Addon(id='plugin.video.jellycon')
+    __pluginpath__ = translate_path(__addon__.getAddonInfo('path'))
+except Exception:
+    # During installation/update, addon might not be fully registered yet
+    __addon__ = None
+    __pluginpath__ = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 
 def getLogger(name=None):
@@ -32,9 +37,14 @@ class LogHandler(logging.StreamHandler):
 
         self.sensitive = {'Token': [], 'Server': []}
 
-        settings = xbmcaddon.Addon()
-        self.server = settings.getSetting('server_address')
-        self.debug = settings.getSetting('log_debug')
+        try:
+            settings = xbmcaddon.Addon()
+            self.server = settings.getSetting('server_address')
+            self.debug = settings.getSetting('log_debug')
+        except Exception:
+            # During installation/update, settings might not be available yet
+            self.server = ''
+            self.debug = 'false'
 
     def emit(self, record):
 
@@ -96,13 +106,16 @@ class MyFormatter(logging.Formatter):
         return result
 
     def formatException(self, exc_info):
-        _pluginpath_real = os.path.realpath(__pluginpath__)
+        try:
+            _pluginpath_real = os.path.realpath(__pluginpath__)
+        except Exception:
+            _pluginpath_real = None
         res = []
 
         for o in traceback.format_exception(*exc_info):
             o = ensure_text(o, get_filesystem_encoding())
 
-            if o.startswith('  File "'):
+            if _pluginpath_real and o.startswith('  File "'):
                 """
                 If this split can't handle your file names,
                 you should seriously consider renaming your files.
@@ -118,7 +131,10 @@ class MyFormatter(logging.Formatter):
 
     def _gen_rel_path(self, record):
         if record.pathname:
-            record.relpath = os.path.relpath(record.pathname, __pluginpath__)
+            try:
+                record.relpath = os.path.relpath(record.pathname, __pluginpath__)
+            except Exception:
+                record.relpath = record.pathname
 
 
 def get_filesystem_encoding():