[PATCH 09/16] qapi/expr.py: rewrite check_if

[John Snow]

This is a only minor rewrite to address some minor style nits.  Don't
compare against the empty list to check for the empty condition, and
move the normalization forward to unify the check on the now-normalized
structure.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 scripts/qapi/expr.py | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py
index 6b064a2138..5d5c3d050d 100644
--- a/scripts/qapi/expr.py
+++ b/scripts/qapi/expr.py
@@ -136,15 +136,15 @@ def check_if_str(ifcond: object) -> None:
     ifcond = expr.get('if')
     if ifcond is None:
         return
-    if isinstance(ifcond, list):
-        if ifcond == []:
-            raise QAPISemError(
-                info, "'if' condition [] of %s is useless" % source)
-        for elt in ifcond:
-            check_if_str(elt)
-    else:
-        check_if_str(ifcond)
-        expr['if'] = [ifcond]
+
+    if not isinstance(ifcond, list):
+        ifcond = [ifcond]
+        expr['if'] = ifcond
+    if not ifcond:
+        raise QAPISemError(
+            info, "'if' condition [] of %s is useless" % source)
+    for elt in ifcond:
+        check_if_str(elt)
 
 
 def normalize_members(members: object) -> None:
-- 
2.26.2