Allow full parsing of Current.rawins from UCAR

lib/xmet/raob.py

@@ -46,6 +46,9 @@ class RAOBSounding():
     def finish(self) -> Sounding:
         timestamp = self.parse_timestamp(self.timestamp)
 
+        if timestamp is None:
+            return
+
         sounding = Sounding()
         sounding.samples = list()
         sounding.station = self.station
@@ -519,6 +522,9 @@ class RAOBReader():
                 for data in samples:
                     pressure = data['pressure']
 
+                    if pressure is None:
+                        continue
+
                     sounding.record_height(pressure, data.get('height'))
 
                     sounding.record_temp_dewpoint(pressure,
@@ -530,7 +536,10 @@ class RAOBReader():
                                                    data.get('wind_dir'))
 
         for key in self.soundings:
-            yield self.soundings[key].finish()
+            sounding = self.soundings[key].finish()
+
+            if sounding is not None:
+                yield sounding
 
     @staticmethod
     def each_sounding_from_fh(fh: io.TextIOBase):