Fix assert in SkinManager when file referenced by <application_logo> tag is missing

checkin_notes

@@ -6223,7 +6223,9 @@ Charlie 25 Oct 2012
     - Mac: Fix Quit command in Simple View and a crash bug with Quit AppleEvent.
     - Fix a bad FlexGridSizer in Simple Preferences dialog which caused assert.
     - Fix assert in Simple Preferences: use window foreground color for 
-        CTransparentStaticLine if skin does not specify <static_line_color>.
+        CTransparentStaticLine if skin does not specify <static_line_color> tag.
+    - Fix assert in SkinManager when file referenced by <application_logo> tag 
+        is missing.
 
     clientgui/
         BOINCGUIApp.cpp
@@ -6232,3 +6234,4 @@ Charlie 25 Oct 2012
             MacBitmapComboBox.cpp,.h
         sg_CustomControls.cpp,.h
         sg_DlgPreferences.cpp
+        SkinManager.cpp

clientgui/SkinManager.cpp

@@ -25,6 +25,7 @@
 #include "util.h"
 #include "error_numbers.h"
 #include "miofile.h"
+#include "filesys.h"
 #include "BOINCGUIApp.h"
 #include "BOINCBaseFrame.h"
 #include "SkinManager.h"
@@ -414,7 +415,9 @@ int CSkinAdvanced::Parse(MIOFILE& in) {
                     wxGetApp().GetSkinManager()->ConstructSkinPath() +
                     wxString(strBuffer.c_str(), wxConvUTF8)
                 );
-                m_bitmapApplicationLogo = wxBitmap(wxImage(str.c_str(), wxBITMAP_TYPE_ANY));
+                if (boinc_file_exists(str.c_str())) {
+                    m_bitmapApplicationLogo = wxBitmap(wxImage(str.c_str(), wxBITMAP_TYPE_ANY));
+                }
             }
             continue;
         } else if (parse_str(buf, "<organization_name>", strBuffer)) {