Clean up decryption logic a bit

Author: salbertson

app/models/user.rb

@@ -43,10 +43,7 @@ def token=(value)
   end
 
   def token
-    encrypted_token = self[:token]
-    unless encrypted_token.nil?
-      crypt.decrypt_and_verify(encrypted_token)
-    end
+    crypt.decrypt_and_verify(self[:token]) if self[:token]
   end
 
   def payment_gateway_subscription

app/models/violation.rb

@@ -21,10 +21,7 @@ def source=(value)
   end
 
   def source
-    encrypted_source = self[:source]
-    unless encrypted_source.nil?
-      crypt.decrypt_and_verify(encrypted_source)
-    end
+    crypt.decrypt_and_verify(self[:source]) if self[:source]
   end
 
   private