Move open() calls out of the try block

sphinx/config.py

@@ -165,8 +165,8 @@ class Config(object):
             try:
                 try:
                     os.chdir(dirname)
-                    try:
                     f = open(config_file, 'U')
+                    try:
                         exec f in config
                     finally:
                         f.close()

tests/test_quickstart.py

@@ -85,8 +85,8 @@ def test_quickstart_defaults(tempdir):
     conffile = tempdir / 'conf.py'
     assert conffile.isfile()
     ns = {}
-    try:
     f = open(conffile, 'U')
+    try:
         exec f in ns
     finally:
         f.close()
@@ -142,8 +142,8 @@ def test_quickstart_all_answers(tempdir):
     conffile = tempdir / 'source' / 'conf.py'
     assert conffile.isfile()
     ns = {}
-    try:
     f = open(conffile, 'U')
+    try:
         exec f in ns
     finally:
         f.close()