From b4f4a70f604ddcb4e8e343aa0e690764fc46d780 Mon Sep 17 00:00:00 2001
From: Kevin Hendricks <kevin.b.hendricks@icloud.com>
Date: Wed, 26 Jun 2019 19:04:35 -0400
Subject: [PATCH] try again to fix toX generated null pointer

---
 src/FlightCrew/Framework/ValidateEpub.cpp | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/FlightCrew/Framework/ValidateEpub.cpp b/src/FlightCrew/Framework/ValidateEpub.cpp
index 80235a6..1353ce4 100644
--- a/src/FlightCrew/Framework/ValidateEpub.cpp
+++ b/src/FlightCrew/Framework/ValidateEpub.cpp
@@ -146,11 +146,14 @@ std::vector< fs::path > GetRelativePathsToXhtmlDocuments( const xc::DOMDocument
         std::string href       = fromX( item->getAttribute( toX( "href" )       ) );
         std::string media_type = fromX( item->getAttribute( toX( "media-type" ) ) );
 
-        if ( xc::XMLUri::isValidURI( true, toX( href ) ) &&
-             ( media_type == XHTML_MIME || media_type == OEB_DOC_MIME ) )
-        {                    
-            paths.push_back( Util::Utf8PathToBoostPath( Util::UrlDecode( href ) ) );
-        }
+	if (!href.empty()) {
+
+             if ( xc::XMLUri::isValidURI( true, toX( href ) ) &&
+                  ( media_type == XHTML_MIME || media_type == OEB_DOC_MIME ) )
+             {
+                  paths.push_back( Util::Utf8PathToBoostPath( Util::UrlDecode( href ) ) );
+             }
+	}
     }
 
     return paths;