Remove cache operation from ipinfo; shortcut where possible

This comes with something of a refactor.

- IPINFO_TOKEN is now checked with `if not` to reduce indention
- ConnectionError is increased to RequestException to catch all requests
  errors
  - On that note, now raising for status too
- Now catching ValueError in case of json parsing failure

lib/location.py

@@ -143,20 +143,19 @@ def ip2location(ip_addr):
 
 
 def ipinfo(ip_addr):
-    location = ipcache(ip_addr)
-    if location:
-        return location
-    if IPINFO_TOKEN:
-        r = requests.get('https://ipinfo.io/%s/json?token=%s' %
-                         (ip_addr, IPINFO_TOKEN))
-        if r.status_code == 200:
-            r_json = r.json()
-            location = r_json["city"], r_json["region"], r_json["country"]
-        else:
-            location = None, None, None
-    if location:
-        ipcachewrite(ip_addr, location)
-    return location
+    if not IPINFO_TOKEN:
+        return None, None, None
+    try:
+        r = requests.get(
+            'https://ipinfo.io/%s/json?token=%s'
+            % (ip_addr, IPINFO_TOKEN))
+        r.raise_for_status()
+        r_json = r.json()
+        city, region, country = r_json["city"], r_json["region"], r_json["country"]
+    except (requests.exceptions.RequestException, ValueError):
+        # latter is thrown by failure to parse json in reponse
+        return None, None, None
+    return city, region, country
 
 
 def geoip(ip_addr):