db_describes requires 'table' paramater

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@39493 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/db.dropcolumn/db.dropcolumn.py

@@ -69,7 +69,7 @@ def main():
     if column == "cat":
 	grass.warning(_("Deleting <%s> column which may be needed to keep table connected to a vector map") % column)
 
-    cols = [f[0] for f in grass.db_describe()['cols']]
+    cols = [f[0] for f in grass.db_describe(table)['cols']]
     if column not in cols:
 	grass.fatal(_("Column <%s> not found in table") % column)