[LyX/master] Add slightly improved error message.

[Richard Kimberly Heck]

commit ae45a5de59340e4c303ac339a95f9ad91092be06
Author: Richard Kimberly Heck <rikih...@lyx.org>
Date:   Mon Apr 23 20:35:39 2018 -0400

    Add slightly improved error message.
    
    (cherry picked from commit 4f0504d7780dcfcab374de069982dfcf97d9a03f)
---
 src/LyXRC.cpp |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/src/LyXRC.cpp b/src/LyXRC.cpp
index 0ec6f78..4882bd2 100644
--- a/src/LyXRC.cpp
+++ b/src/LyXRC.cpp
@@ -407,6 +407,8 @@ bool LyXRC::read(FileName const & filename, bool 
check_format)
                lexrc2.setFile(tempfile);
                LYXERR(Debug::LYXRC, "Reading '" << tempfile << "'...");
                retval = read(lexrc2, check_format);
+               if (retval == FormatMismatch)
+                       LYXERR0("Conversion failed for " << 
filename.absFileName());
        }
        return retval == ReadOK;
 }