Avoid useless warning from Qt

When cloning InsetExternal, the tempname_ member of InsetExternalParams
has yet to be initialized. So, trying to remove it causes the warning
"QFile::remove: Empty or null file name".

diff --git a/src/insets/InsetExternal.cpp b/src/insets/InsetExternal.cpp
index b68a09d77fc10e1663b7f645eb1ed6dabac70018..00c304ac3075c49fd903fe0333dc1eb70aa6827b 100644 (file)
--- a/src/insets/InsetExternal.cpp
+++ b/src/insets/InsetExternal.cpp
@@ -99,7 +99,8 @@ TempName::~TempName()
 TempName & TempName::operator=(TempName const & other)
 {
        if (this != &other) {
-               tempname_.removeFile();
+               if (!tempname_.empty())
+                       tempname_.removeFile();
                support::TempFile f("lyxextXXXXXX.tmp");
                f.setAutoRemove(false);
                tempname_ = f.name();