History invocation in Molby Console may crash when nil is the result

git-svn-id: svn+ssh://svn.sourceforge.jp/svnroot/molby/trunk@514 a2be9bc6-48de-4e38-9406-05402d4bc13c

diff --git a/wxSources/ConsoleFrame.cpp b/wxSources/ConsoleFrame.cpp
index 213ec07..a8e3775 100755 (executable)
--- a/wxSources/ConsoleFrame.cpp
+++ b/wxSources/ConsoleFrame.cpp
@@ -438,6 +438,8 @@ ConsoleFrame::ShowHistory(bool up, bool option)
                        }
                }
        }
+       if (p == NULL)
+               p = "";
        textCtrl->Replace(historyPos, textCtrl->GetLastPosition(), wxT(""));
        SetConsoleColor(option ? 1 : 3);
        while (isspace(*p))