Item_func_geometry_from_text::val_str() should set null_value
in case of wrong data.


mysql-test/include/gis_generic.inc:
  after merge fix
  
  Item_func_geometry_from_text::val_str() should set null_value
  in case of wrong data.
mysql-test/r/archive_gis.result:
  after merge fix
  
  Item_func_geometry_from_text::val_str() should set null_value
  in case of wrong data.
mysql-test/r/gis.result:
  after merge fix
  
  Item_func_geometry_from_text::val_str() should set null_value
  in case of wrong data.
mysql-test/r/innodb_gis.result:
  after merge fix
  
  Item_func_geometry_from_text::val_str() should set null_value
  in case of wrong data.
mysql-test/r/ndb_gis.result:
  after merge fix
  
  Item_func_geometry_from_text::val_str() should set null_value
  in case of wrong data.
mysql-test/t/gis.test:
  after merge fix
  
  Item_func_geometry_from_text::val_str() should set null_value
  in case of wrong data.
sql/item_geofunc.cc:
  after merge fix
  
  Item_func_geometry_from_text::val_str() should set null_value
  in case of wrong data.