Add checks for empty frame to quicklooks

aosstower/tower_quicklooks/create_quicklook.py

@@ -217,19 +217,19 @@ class PlotMaker(object):
         :param shared_x:
         :return:
         """
+        specific_frame = frame[[x for x in frame.columns if x in self.deps]]
+        if frame.empty or specific_frame.empty or specific_frame.isnull().all().any():
+            raise ValueError("No valid data found or missing necessary data to make {}".format(self.name))
         if start_time is None:
             start_time = frame.index[0].to_pydatetime()
         if end_time is None:
             end_time = frame.index[-1].to_pydatetime()
 
-        # TODO: If frame is empty, make an empty plot
         ax = self._get_axes(fig, is_subplot, shared_x)
         self._set_title(frame, fig, ax,
                         start_time=start_time, end_time=end_time,
                         title=title, is_subplot=is_subplot)
 
-        # get the min for each column then combine them assuming we can
-        specific_frame = frame[[x for x in frame.columns if x in self.deps]]
         # make ticks show up on top and bottom inside and out of the axis line
         ax.xaxis.set_tick_params(left=True, right=True, direction='inout')
         lines = self._call_plot(specific_frame, ax)
@@ -427,7 +427,11 @@ def create_plot(plot_names, frame, output,
         plot_frame = plot_frame[~plot_frame.isnull().any(axis=1)]
 
         fig = plt.figure()
-        ax = plot_maker.create_plot(plot_frame, fig, start_time=start_time, end_time=end_time)
+        try:
+            ax = plot_maker.create_plot(plot_frame, fig, start_time=start_time, end_time=end_time)
+        except ValueError:
+            LOG.error("Could not make '{}'".format(name), exc_info=True)
+            continue
 
         out_fn = output.format(plot_name=name, start_time=start_time, end_time=end_time)
         LOG.info("Saving plot '{}' to filename '{}'".format(name, out_fn))