added error handling

worker.py

@@ -24,7 +24,10 @@ if (jobtype == 'thumbnail'):
 	inputfile  = config['MAIN']['VIDEOS_RELEASED']+'/'+data['path']
 	outputfile = config['MAIN']['VIDEOS_RELEASED']+'/'+config['thumbnail']['folder']+'/'+'l_'+str(data['lectureid'])+'.jpg'
 	api.job_ping(id=id)
+	try:
 		duration = float(subprocess.check_output(["ffprobe", "-v", "error", "-show_entries", "format=duration", "-of", "default=noprint_wrappers=1:nokey=1", inputfile]))
+	except:
+		duration = 0
 	api.job_ping(id=id)
 	if subprocess.call(["ffmpeg", "-loglevel", "error", "-y", "-ss", str(duration*0.4), "-i", inputfile, "-vf", "scale=640:-1", "-frames:v", "1", outputfile]) == 0:
 		api.job_ping(id=id,state='finished')