Merge branch 'lukas_issue215_bug_time-series-plot-on-hdfml' into 'develop'

Resolve "BUG: time series plot on HDFML"

See merge request toar/mlair!190

mlair/plotting/postprocessing_plotting.py

@@ -838,8 +838,8 @@ class PlotTimeSeries:
         factor = 1
         if self._sampling == "h":
             factor = 2
-        f, ax = plt.subplots((end - start + 1) * factor, sharey=True, figsize=(50, 30))
-        return f, ax, factor
+        f, ax = plt.subplots((end - start + 1) * factor, sharey=True, figsize=(50, 30), squeeze=False)
+        return f, ax[:, 0], factor
 
     def _plot_ahead(self, ax, data):
         color = sns.color_palette("Blues_d", self._window_lead_time).as_hex()