rm unnecessary comparisons

Author: amorison

src/stagpy/step.py

@@ -336,9 +336,10 @@ def __getitem__(self, name: str) -> Field:
 
     def __contains__(self, item: Any) -> bool:
         try:
-            return self[item] is not None
+            _ = self[item]
         except error.MissingDataError:
             return False
+        return True
 
     def __eq__(self, other: object) -> bool:
         return self is other

src/stagpy/time_series.py

@@ -125,9 +125,6 @@ def compstat(
 def cmd(conf: Config) -> None:
     """Implementation of time subcommand."""
     sdat = _sdat_from_conf(conf.core)
-    if sdat.tseries is None:
-        return
-
     if conf.time.fraction is not None:
         if not 0 < conf.time.fraction <= 1:
             raise InvalidTimeFractionError(conf.time.fraction)