[LyX/master] Check if literal param exists before querying value.

[Juergen Spitzmueller]

commit caf72c07cdf9eee510afaab465354e2e8b9c04c9
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Mon Jan 30 08:27:53 2017 +0100

    Check if literal param exists before querying value.
    
    Otherwise LyX asserts.
---
 src/insets/InsetCommand.cpp |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/insets/InsetCommand.cpp b/src/insets/InsetCommand.cpp
index 2e24d4d..f4f1692 100644
--- a/src/insets/InsetCommand.cpp
+++ b/src/insets/InsetCommand.cpp
@@ -160,7 +160,8 @@ int InsetCommand::docbook(odocstream &, OutputParams const 
&) const
 
 void InsetCommand::validate(LaTeXFeatures & features) const
 {
-       if (params()["literal"] == "true")
+       if (params().info().hasParam("literal")
+           && params()["literal"] == "true")
                return;
 
        ParamInfo::const_iterator it = params().info().begin();