Crash on Creating New Symbol Library (windows)
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# Description
Attempting to Create a new Library in the Symbol Editor crashes KiCad
Windows Event Log information:
```
Log Name: Application
Source: Application Error
Date: 2020-09-21 8:58:35 AM
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Description:
Faulting application name: kicad.exe, version: 0.0.0.0, time stamp: 0x00000000
Faulting module name: wxbase30u_gcc_custom.dll, version: 3.0.4.0, time stamp: 0x00000000
Exception code: 0xc0000005
Fault offset: 0x0000000000189aca
Faulting process id: 0x9bc
Faulting application start time: 0x01d6902ff5532dbf
Faulting application path: C:\Program Files\KiCad\bin\kicad.exe
Faulting module path: C:\Program Files\KiCad\bin\wxbase30u_gcc_custom.dll
Report Id: 23ae3189-3ddb-4bab-8d16-baa954a85c33
Faulting package full name:
Faulting package-relative application ID:
```
# Steps to reproduce
1. Open the Symbol Editor
2. Go to File->New Library
3. Type in a file name and click on Save.
4. Occasionally the "Select Global/Project window appears before crashing, sometimes it does not.
# KiCad Version
```
Application: KiCad
Version: (5.1.6)-1, release build
Libraries:
wxWidgets 3.0.4
libcurl/7.66.0 OpenSSL/1.1.1d (Schannel) zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.1.1) nghttp2/1.39.2
Platform: Windows 8 (build 9200), 64-bit edition, 64 bit, Little endian, wxMSW
Build Info:
wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8)
Boost: 1.71.0
OpenCASCADE Community Edition: 6.9.1
Curl: 7.66.0
Compiler: GCC 9.2.0 with C++ ABI 1013
Build settings:
USE_WX_GRAPHICS_CONTEXT=OFF
USE_WX_OVERLAY=OFF
KICAD_SCRIPTING=ON
KICAD_SCRIPTING_MODULES=ON
KICAD_SCRIPTING_PYTHON3=OFF
KICAD_SCRIPTING_WXPYTHON=ON
KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
KICAD_SCRIPTING_ACTION_MENU=ON
BUILD_GITHUB_PLUGIN=ON
KICAD_USE_OCE=ON
KICAD_USE_OCC=OFF
KICAD_SPICE=ON
```
issue