Fix nocatch on incoming answer with faulty Experimental-Result-Code

Failure to decode the Grouped AVP results in a throw from module
diameter_gen, which is caught in the normal message decode, but wasn't
when only the AVP is decoded from diameter_traffic (for error checking
and counter increment). The result was no handle_answer/error
callback, and an error return from diameter:call/4 when the detach
option was not specified.

2 files changed, 3 insertions, 1 deletions

diff --git a/lib/diameter/src/base/diameter_gen.erl b/lib/diameter/src/base/diameter_gen.erl
index 93ebe57685..d30c3d0441 100644
--- a/lib/diameter/src/base/diameter_gen.erl
+++ b/lib/diameter/src/base/diameter_gen.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2010-2017. All Rights Reserved.
+%% Copyright Ericsson AB 2010-2019. All Rights Reserved.
 %%
 %% Licensed under the Apache License, Version 2.0 (the "License");
 %% you may not use this file except in compliance with the License.
diff --git a/lib/diameter/src/base/diameter_traffic.erl b/lib/diameter/src/base/diameter_traffic.erl
index d2856ae530..2d3e4a2ac9 100644
--- a/lib/diameter/src/base/diameter_traffic.erl
+++ b/lib/diameter/src/base/diameter_traffic.erl
@@ -1925,6 +1925,8 @@ get_avp(Dict, Name, [#diameter_header{} | Avps]) ->
         A = find_avp(Code, Vid, Avps),
         avp_decode(Dict, Name, ungroup(A))
     catch
+        {diameter_gen, _} ->  %% faulty Grouped AVP
+            undefined;
         error: _ ->
             undefined
     end;