wxGUI/psmap: fix vector map properties dialog correct typing the name of the vector map

[tmszi]

Describe the bug
Typing the name of the vector map by keyboard inside vector map properties dialog (Map TextCtrl widget) print error message.

To Reproduce
Steps to reproduce the behavior:

1. Launch Cartographic composer GUI g.gui.psmap
2. Add map frame with some raster map e.g. elevation
3. Add vector map layer by typing vector map name by keyboards e.g. streams
4. See error

Traceback (most recent call last):
  File "/usr/lib64/grass84/gui/wxpython/psmap/dialogs.py",
line 1865, in OnVector

topoInfo = grass.vector_info_topo(map=vmap)
  File
"/usr/lib64/grass84/etc/python/grass/script/vector.py", line
185, in vector_info_topo

s = read_command("v.info", flags="t", layer=layer, map=map,
env=env)
  File "/usr/lib64/grass84/etc/python/grass/script/core.py",
line 533, in read_command

return handle_errors(returncode, stdout, args, kwargs)
  File "/usr/lib64/grass84/etc/python/grass/script/core.py",
line 345, in handle_errors

raise CalledModuleError(module=module, code=code,
returncode=returncode)
grass.exceptions
.
CalledModuleError
:
Module run `v.info -t layer=1 map=s` ended with an error.
The subprocess ended with a non-zero return code: 1. See
errors above the traceback or in the error output.

and inside GRASS GIS session emulator terminal is printed error message too:

GRASS_INFO_ERROR(17890,1): Vector map <s> not found
GRASS_INFO_END(17890,1)

GRASS_INFO_ERROR(17891,1): Vector map <st> not found
GRASS_INFO_END(17891,1)

GRASS_INFO_ERROR(17892,1): Vector map <str> not found
GRASS_INFO_END(17892,1)

GRASS_INFO_ERROR(17893,1): Vector map <stre> not found
GRASS_INFO_END(17893,1)

GRASS_INFO_ERROR(17894,1): Vector map <strea> not found
GRASS_INFO_END(17894,1)

GRASS_INFO_ERROR(17895,1): Vector map <stream> not found
GRASS_INFO_END(17895,1)

Expected behavior
Typing the name of the vector map by keyboard inside vector map properties dialog (Map TextCtrl widget) should not print error messages.

System description (please complete the following information):

• Operating System: all
• GRASS GIS version: all