sqlite: skip reading featureset if no wkb is found; rasterlite: link to boost libs on mac os x

plugins/input/rasterlite/SConscript

@@ -34,9 +34,12 @@ rasterlite_src = Split(
         )
 
 libraries = [env['PLUGINS']['rasterlite']['lib']]
+
 if env['PLATFORM'] == 'Darwin':
     libraries.append('mapnik2')
     libraries.append(env['ICU_LIB_NAME'])
+    libraries.append('boost_system%s' % env['BOOST_APPEND'])
+    libraries.append('boost_filesystem%s' % env['BOOST_APPEND'])
 
 rasterlite_inputdriver = plugin_env.SharedLibrary('../rasterlite', source=rasterlite_src, SHLIBPREFIX='', SHLIBSUFFIX='.input', LIBS=libraries, LINKFLAGS=env['CUSTOM_LDFLAGS'])
 

plugins/input/sqlite/sqlite_featureset.cpp

@@ -67,6 +67,8 @@ feature_ptr sqlite_featureset::next()
     {
         int size;
         const char* data = (const char *) rs_->column_blob (0, size);
+        if (!data)
+            return feature_ptr();
         int feature_id = rs_->column_integer (1);   
 
 #ifdef MAPNIK_DEBUG