conditionally allow intercept of replaced call-id when processing replaces header

without this change one leg calls inhaled could not be picked because there is no bridge_uuid.

FS-7463 #resolve

src/mod/endpoints/mod_sofia/sofia.c

@@ -9885,11 +9885,13 @@ void sofia_handle_sip_i_invite(switch_core_session_t *session, nua_t *nua, sofia
 																						   "%sanswer,sofia_sla:%s", codec_str, b_private->uuid);
 					}
 				} else {
-					char* pickup = NULL;
-					if(sip->sip_replaces->rq_url->url_params && sip->sip_replaces->rp_call_id) {
-						pickup = switch_find_parameter(sip->sip_replaces->rq_url->url_params,"pickup", switch_core_session_get_pool(session));
+					char *aleg = NULL;
+
+					if (sip->sip_replaces && sip->sip_replaces->rp_params && sip->sip_replaces->rp_call_id) {
+						aleg = switch_find_parameter(sip->sip_replaces->rp_params, "a-leg", switch_core_session_get_pool(session));
 					} 
-					if(pickup) {
+
+					if (aleg) {
 						switch_channel_mark_hold(b_channel, SWITCH_FALSE);
 						tech_pvt->caller_profile->destination_number = switch_core_sprintf(tech_pvt->caller_profile->pool, "answer,intercept:%s", sip->sip_replaces->rp_call_id);
 					} else if (!zstr(bridge_uuid)) {