qerror: introduce QERR_INVALID_OPTION_GROUP

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-By: Laszlo Ersek <lersek@redhat.com>

qerror.c

@@ -155,6 +155,10 @@ static const QErrorStringTable qerror_table[] = {
         .error_fmt = QERR_INVALID_BLOCK_FORMAT,
         .desc      = "Invalid block format '%(name)'",
     },
+    {
+        .error_fmt = QERR_INVALID_OPTION_GROUP,
+        .desc      = "There is no option group '%(group)'",
+    },
     {
         .error_fmt = QERR_INVALID_PARAMETER,
         .desc      = "Invalid parameter '%(name)'",

qerror.h

@@ -139,6 +139,9 @@ QError *qobject_to_qerror(const QObject *obj);
 #define QERR_INVALID_BLOCK_FORMAT \
     "{ 'class': 'InvalidBlockFormat', 'data': { 'name': %s } }"
 
+#define QERR_INVALID_OPTION_GROUP \
+    "{ 'class': 'InvalidOptionGroup', 'data': { 'group': %s } }"
+
 #define QERR_INVALID_PARAMETER \
     "{ 'class': 'InvalidParameter', 'data': { 'name': %s } }"