Fix more RAOB parsing issues

lib/xmet/raob.py

@@ -102,6 +102,7 @@ class RAOBObs():
         self.tokens: list[str] = list()
 
     def read(self, token: str):
+        if token != '':
             self.tokens.append(token)
 
     def parse_timestamp(self, token: str):
@@ -130,7 +131,6 @@ class RAOBObs():
         if token[0:2] == '//':
             temp = None
         else:
-            print(f"Got token {token}")
             tenths = int(token[2])
             sign   = 1 if tenths % 2 == 0 else -1
 
@@ -348,14 +348,20 @@ class RAOBObs():
 
     def parse_ttbb_sample(self, tokens: list[str]) -> dict:
         hp = self.parse_pressure(tokens[0])
-        td = self.parse_temp_dewpoint(tokens[1])
 
-        return {
+        ret = {
             'pressure': hp['pressure'],
-            'temp':     td['temp'],
-            'dewpoint': td['dewpoint']
+            'temp':     None,
+            'dewpoint': None
         }
 
+        if len(tokens) > 1:
+            td = self.parse_temp_dewpoint(tokens[1])
+            ret['temp']     = td['temp']
+            ret['dewpoint'] = td['dewpoint']
+
+        return ret
+
     def parse_ttbb(self) -> dict:
         station   = self.tokens[0]
         timestamp = self.tokens[1]