allow claling Unassociate() on previously not initialized wxMimeTypesManager

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39780 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/mimecmn.cpp

@@ -527,6 +527,8 @@ wxMimeTypesManager::~wxMimeTypesManager()
 
 bool wxMimeTypesManager::Unassociate(wxFileType *ft)
 {
+    EnsureImpl();
+
 #if defined(__UNIX__) && !defined(__CYGWIN__) && !defined(__WINE__)
     return m_impl->Unassociate(ft);
 #else

src/unix/mimetype.cpp

@@ -2643,6 +2643,8 @@ size_t wxMimeTypesManagerImpl::EnumAllFileTypes(wxArrayString& mimetypes)
 
 bool wxMimeTypesManagerImpl::Unassociate(wxFileType *ft)
 {
+    InitIfNeeded();
+
     wxArrayString sMimeTypes;
     ft->GetMimeTypes(sMimeTypes);