[meld] filters: Rearrange the shell pattern split logic to be slightly clearer

[Kai Willadsen <kaiw src gnome org>]

commit f2b9731aa3b23919605319855ab57e7582e0092a
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sun Oct 28 07:41:01 2018 +1000

    filters: Rearrange the shell pattern split logic to be slightly clearer

 meld/filters.py | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/meld/filters.py b/meld/filters.py
index 94fb5f46..0012bfa5 100644
--- a/meld/filters.py
+++ b/meld/filters.py
@@ -47,14 +47,14 @@ class FilterEntry:
     @classmethod
     def _compile_shell_pattern(cls, pattern):
         bits = pattern.split()
-        if len(bits) > 1:
+        if not bits:
+            # An empty pattern would match everything, so skip it
+            return None
+        elif len(bits) > 1:
             regexes = [misc.shell_to_regex(b)[:-1] for b in bits]
             regex = "(%s)$" % "|".join(regexes)
-        elif len(bits):
-            regex = misc.shell_to_regex(bits[0])
         else:
-            # An empty pattern would match everything, so skip it
-            return None
+            regex = misc.shell_to_regex(bits[0])
 
         try:
             compiled = re.compile(regex)