Adding a check to make sure either spaces or null values are not mistakenly added into the key variable

pre_commit_hooks/detect_aws_credentials.py

diff --git a/pre_commit_hooks/detect_aws_credentials.py b/pre_commit_hooks/detect_aws_credentials.py
index b2afd71..47a69bf 100644
--- a/pre_commit_hooks/detect_aws_credentials.py
+++ b/pre_commit_hooks/detect_aws_credentials.py
@@ -53,7 +53,9 @@
             'aws_session_token',
         ):
             try:
-                keys.add(parser.get(section, var))
+                key = parser.get(section, var).strip()
+                if key:
+                    keys.add(key)
             except configparser.NoOptionError:
                 pass
     return keys