gci: Fail gracefully when GCI token not available

When the GCI token is not available, the GCI page
should fail to build, while letting other parts of the
website be build.

Related to coala#3

gci/views.py

@@ -3,6 +3,7 @@
 from calendar import timegm
 import requests
 
+from gci.config import get_api_key
 from .students import get_students, get_linked_students
 from .gitorg import get_logo
 
@@ -14,6 +15,20 @@
 
 
 def index(request):
+    try:
+        client = get_api_key('GCI')
+    except BaseException:
+        client = None
+
+    if client:
+        s = gci_overview()
+    else:
+        s = ['GCI data not available']
+
+    return HttpResponse('\n'.join(s))
+
+
+def gci_overview():
     linked_students = list(get_linked_students(get_students()))
     org_id = linked_students[0]['organization_id']
     org_name = linked_students[0]['organization_name']
@@ -66,4 +81,4 @@ def index(request):
     s.append('<script src="static/timeago.js"></script>')
     s.append('<script>loadTimeElements()</script>')
 
-    return HttpResponse('\n'.join(s))
+    return s