Crash when starting viewer with DisplayTimecode set

[akleshchev]

Scenario:

• Launch a release viewer
• Login
• Enable DisplayTimecode in debug settings
• Confirm crash on production
• Launch viewer with code patch
• Login
• Enable DisplayTimecode in debug settings
• Confirm viewer no longer crashes

Expected:
No crash

Actual:
Crash at LLGLSLShader::sCurBoundShaderPtr != nullptr