[calls] sip: media-pipeline: Allow new pipeline without codec set

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit f3a6c15e6a8befe2ee9b7f4942aaa5020a1a9b38
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Mon Feb 28 09:47:00 2022 +0100

    sip: media-pipeline: Allow new pipeline without codec set

 plugins/sip/calls-sip-media-pipeline.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)
---
diff --git a/plugins/sip/calls-sip-media-pipeline.c b/plugins/sip/calls-sip-media-pipeline.c
index 84af9fa4..285b4c43 100644
--- a/plugins/sip/calls-sip-media-pipeline.c
+++ b/plugins/sip/calls-sip-media-pipeline.c
@@ -784,10 +784,12 @@ calls_sip_media_pipeline_new (MediaCodecInfo *codec)
   pipeline = g_initable_new (CALLS_TYPE_SIP_MEDIA_PIPELINE, NULL, &error,
                              NULL);
 
-  if (pipeline)
-    g_object_set (pipeline, "codec", codec, NULL);
-  else
+  if (pipeline) {
+    if (codec)
+      g_object_set (pipeline, "codec", codec, NULL);
+  } else {
     g_warning ("Media pipeline could not be initialized: %s", error->message);
+  }
 
   return pipeline;
 }
@@ -901,6 +903,11 @@ calls_sip_media_pipeline_start (CallsSipMediaPipeline *self)
   GSocket *socket;
   g_return_if_fail (CALLS_IS_SIP_MEDIA_PIPELINE (self));
 
+  if (!self->codec) {
+    g_warning ("Codec not set for this pipeline. Cannot start");
+    return;
+  }
+
   g_debug ("Starting media pipeline");
   self->is_running = TRUE;