WIP: Obsrio/PCDCP Processing Pipeline

Fixes #12 (closed), #10

Depends on !98 (closed)

geomagio/edge/EdgeFactory.py

@@ -199,6 +199,11 @@ class EdgeFactory(TimeseriesFactory):
             channel and that trace should have an ndarray, with nan's
             representing gaps.
         """
+        if TimeseriesUtility.has_any_channels(
+            stream=timeseries, channels=channels, starttime=starttime, endtime=endtime
+        ):
+            sys.stderr.write("No data to write\n")
+            return
         stats = timeseries[0].stats
         observatory = observatory or stats.station or self.observatory
         channels = channels or self.channels