Fix the issue with CentOS 8 not being recognized

diff --git a/hammer.py b/hammer.py
old mode 100755 (executable)
new mode 100644 (file)
index 8db46b7..324ceb9
--- a/hammer.py
+++ b/hammer.py
@@ -219,6 +219,8 @@ def get_system_revision():
         revision = platform.release()
     if '"' in revision:
         revision = revision.replace('"', '')
+    if '"' in system:
+        system = system.replace('"', '')
     return system.lower(), revision