render wasn't working without audio

pype/plugins/harmony/publish/extract_render.py

@@ -111,13 +111,22 @@ class ExtractRender(pyblish.api.InstancePlugin):
 
         # Generate mov.
         mov_path = os.path.join(path, instance.data["name"] + ".mov")
-        args = [
-            "ffmpeg", "-y",
-            "-i", audio_path,
-            "-i",
-            os.path.join(path, collection.head + "%04d" + collection.tail),
-            mov_path
-        ]
+        if os.path.isfile(audio_path):
+            args = [
+                "ffmpeg", "-y",
+                "-i", audio_path,
+                "-i",
+                os.path.join(path, collection.head + "%04d" + collection.tail),
+                mov_path
+            ]
+        else:
+            args = [
+                "ffmpeg", "-y",
+                "-i",
+                os.path.join(path, collection.head + "%04d" + collection.tail),
+                mov_path
+            ]
+
         process = subprocess.Popen(
             args,
             stdout=subprocess.PIPE,

pype/plugins/harmony/publish/validate_audio.py

@@ -0,0 +1,37 @@
+import json
+import os
+
+import pyblish.api
+
+import avalon.harmony
+import pype.hosts.harmony
+
+
+class ValidateAudio(pyblish.api.InstancePlugin):
+    """Ensures that there is an audio file in the scene. If you are sure that you want to send render without audio, you can disable this validator before clicking on "publish" """
+
+    order = pyblish.api.ValidatorOrder
+    label = "Validate Audio"
+    families = ["render"]
+    hosts = ["harmony"]
+    optional = True
+
+    def process(self, instance):
+        # Collect scene data.
+        func = """function func(write_node)
+        {
+            return [
+                sound.getSoundtrackAll().path()
+            ]
+        }
+        func
+        """
+        result = avalon.harmony.send(
+            {"function": func, "args": [instance[0]]}
+        )["result"]
+
+        audio_path = result[0]
+
+        msg = "You are missing audio file:\n{}".format(audio_path)
+
+        assert os.path.isfile(audio_path), msg