Issue #26 disable search for non all access

 - turn off aa search for non subscribed accounts. searching in the
   local library will still be supported.

ImportList.py

@@ -86,8 +86,7 @@ def search_for_track(details):
         if not len(query):
             query = track
         dlog('aa search query:'+query)
-        aa_results = api.search_all_access(query,max_results=7).get(
-            'song_hits')
+        aa_results = aa_search(query,7)
         dlog('aa search results: '+str(len(aa_results)))
         search_results.extend(aa_results)
 

common.py

@@ -3,6 +3,7 @@
 
 from collections import Counter
 from gmusicapi import Mobileclient
+from gmusicapi.exceptions import CallFailure
 from preferences import *
 import time
 import getpass
@@ -19,6 +20,9 @@
 # provide a shortcut for track_info_separator
 tsep = track_info_separator
 
+# flag indicating if account is all access capable
+allaccess = True
+
 # check for debug set via cmd line
 if '-dDEBUG' in sys.argv:
     debug = True
@@ -58,9 +62,23 @@ def dlog(message):
 def plog(message):
     log(message, nl = False)
 
+# search all access
+def aa_search(search_string,max_results):
+    global allaccess
+    results = []
+    if allaccess:
+        try:
+            results = api.search_all_access(search_string,
+                    max_results=max_results).get('song_hits')
+        except CallFailure:
+            allaccess = False
+            log('WARNING no all access subscription detected. '+
+                ' all access search disabled.')
+    return results
+
 # gets the track details available for google tracks
 def get_google_track_details(sample_song = 'one u2'):
-    results = api.search_all_access(sample_song,max_results=1).get('song_hits')
+    results = aa_search(sample_song,1)
     if len(results):
         return (results[0].get('track').keys())
     return "['title','artist','album']"