wxGUI/datacatalog: fix adding newly created project into projects tree only once (OSGeo#6453)

When newly project is created into new GRASS database directory,
which is not added into data catalog GRASS databases tree (different
from the current default).

Author: tmszi

gui/wxpython/datacatalog/tree.py

@@ -1498,15 +1498,19 @@ def InsertMapset(self, name, location_node):
         return mapset_node
 
     def InsertLocation(self, name, grassdb_node):
-        """Insert new location into model and refresh tree"""
-        location_node = self._model.AppendNode(
-            parent=grassdb_node, data={"type": "location", "name": name}
-        )
-        # reload new location since it has a mapset
-        self._reloadLocationNode(location_node)
-        self._model.SortChildren(grassdb_node)
-        self.RefreshNode(grassdb_node, recursive=True)
-        return location_node
+        """
+        Insert new location into model and refresh tree.
+        Check if not already added.
+        """
+        if not self.GetDbNode(grassdb=grassdb_node.label, location=name):
+            location_node = self._model.AppendNode(
+                parent=grassdb_node, data={"type": "location", "name": name}
+            )
+            # reload new location since it has a mapset
+            self._reloadLocationNode(location_node)
+            self._model.SortChildren(grassdb_node)
+            self.RefreshNode(grassdb_node, recursive=True)
+            return location_node
 
     def InsertGrassDb(self, name):
         """