corporate_identity_test: fix coding style test

This code seems to have been pushed accidentally as part of 6e5e8e8c
(fixup! test: follow recent ImageMagick spec., 2023-10-11)

bt5/erp5_corporate_identity_test/TestTemplateItem/portal_components/test.erp5.testCorporateIdentityTemplateList.py

@@ -259,11 +259,7 @@ class TestCorporateIdentityTemplateList(ERP5TypeTestCase):
     if dump:
       expected_image.setData(png)
       self.tic()
-    try:
-      self.assertImageRenderingEquals(str(png), str(expected_image.getData()))
-    except Exception as e:
-      print id2
-      open('/tmp/%s.png' % id2, 'wb').write(str(png))
+    self.assertImageRenderingEquals(str(png), str(expected_image.getData()))
 
   ##############################################################################
   # What rendering is tested: