[LyX/master] Silence coverity warning.

[Günter Milde]

commit b3fbe4edfd65b6c7acce4f0df9e51673d9958192
Author: Günter Milde <mi...@lyx.org>
Date:   Tue Apr 25 18:42:55 2017 +0200

    Silence coverity warning.
---
 src/insets/InsetSpecialChar.cpp |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/src/insets/InsetSpecialChar.cpp b/src/insets/InsetSpecialChar.cpp
index 4d41984..3e47b64 100644
--- a/src/insets/InsetSpecialChar.cpp
+++ b/src/insets/InsetSpecialChar.cpp
@@ -108,6 +108,8 @@ docstring InsetSpecialChar::toolTip(BufferView const &, 
int, int) const
                case NOBREAKDASH:
                        message = from_ascii("Protected Hyphen (SHY)");
                        break;
+               default:
+                       break;
        }
        return message;
 }