Added Beta version to description

pet-wrapper-api.py

@@ -45,7 +45,7 @@ class PET(plugin.PluginAbstract):
 
     __version__ = (2025, 1, 28)
     __short_description__: str = (
-        "Calculation of daily Potential Evatransporation"
+        "(BETA version) Calculation of daily Potential Evatransporation"
     )
     __category__: Optional[str] = "postproc"
     __tags__: Optional[List[str]] = ["Potential Evatranspiration"]
@@ -137,7 +137,7 @@ class PET(plugin.PluginAbstract):
             ),
         String(
             name="region",
-            mandatory=True,
+            mandatory=False,
             default=None,
             help="Region box to be processed. The format have to be W,E,S,N (e.g. -180,180,0,90 for NH).\nLeave empty to select the region from input grid."
         ),