From f4a1c822b99fcb861f69e2f80af64de86bd1b93f Mon Sep 17 00:00:00 2001
From: Andrej Babic <andrej.babic@psi.ch>
Date: Fri, 21 Aug 2020 15:05:28 +0200
Subject: [PATCH] Invert condition

---
 sf_daq_broker/writer/epics_writer.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sf_daq_broker/writer/epics_writer.py b/sf_daq_broker/writer/epics_writer.py
index 544f70d..7714c3a 100644
--- a/sf_daq_broker/writer/epics_writer.py
+++ b/sf_daq_broker/writer/epics_writer.py
@@ -20,7 +20,7 @@ def write_epics_pvs(output_file, start_pulse_id, stop_pulse_id, metadata, epics_
     data = get_data(epics_pvs, start=start_date, stop=stop_date)
     # TODO: Merge metadata to data.
 
-    if len(data) < 1:
+    if len(data) > 0:
         logger.info("Persist data to hdf5 file")
         data_api.to_hdf5(data, output_file, overwrite=True, compression=None, shuffle=False)
     else: