views: remove null check

- With newer compiler/libraries, getting error
```
VwTxtSrc.cpp(1864,38): error GB35ED869: the address of
‘__MIDL___MIDL_itf_FwKernelTlb_0001_0086_0001::szFaceName’ will
never be NULL [-Werror=address]
1864 |         if (pchrpOverride.szFaceName != NULL &&
wcslen(pchrpOverride.szFaceName) != 0)
        |                                      ^
  In file included from Main.h:95,
                   from VwTxtSrc.cpp:18:
FwKernelTlb.h:740:13: note:
‘__MIDL___MIDL_itf_FwKernelTlb_0001_0086_0001::szFaceName’
declared here
    740 |     OLECHAR szFaceName[ 32 ];
        |             ^~~~~~~~~~
```
  and the same for `szFontVar`.

Change-Id: I6488eb44eef76eeddcd4f6cbd0e6c40c94fb4a70

Src/views/VwTxtSrc.cpp

@@ -1861,9 +1861,9 @@ void VwOverrideTxtSrc::Merge(LgCharRenderProps * pchrpOrig, LgCharRenderProps &
 		pchrpOrig->ttvItalic = pchrpOverride.ttvItalic;
 	if (pchrpOverride.dympHeight > -1)
 		pchrpOrig->dympHeight = pchrpOverride.dympHeight;
-	if (pchrpOverride.szFaceName != NULL && wcslen(pchrpOverride.szFaceName) != 0)
+	if (wcslen(pchrpOverride.szFaceName) != 0)
 		wcscpy_s(pchrpOrig->szFaceName, LF_FACESIZE, pchrpOverride.szFaceName);
-	if (pchrpOverride.szFontVar != NULL && wcslen(pchrpOverride.szFontVar) != 0)
+	if (wcslen(pchrpOverride.szFontVar) != 0)
 		wcscpy_s(pchrpOrig->szFontVar, 64, pchrpOverride.szFontVar);
 }