Don't return a 500 error for entries without priority metadata

This change makes an entry with no priority metadata default to
"OK" instead of returning a 500 error.

Tested:
Logged an entry without priority and confirmed that getting the
Entries returns 200.

Passed the Redfish Service Validator.

Change-Id: I5a4633ef8542da6eaacad28953e5c99d992576fa
Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
diff --git a/redfish-core/lib/log_services.hpp b/redfish-core/lib/log_services.hpp
index 578e673..9fd35a9 100644
--- a/redfish-core/lib/log_services.hpp
+++ b/redfish-core/lib/log_services.hpp
@@ -1254,7 +1254,6 @@
     if (ret < 0)
     {
         BMCWEB_LOG_ERROR << "Failed to read PRIORITY field: " << strerror(-ret);
-        return 1;
     }
 
     // Get the Created time from the timestamp
@@ -1275,8 +1274,7 @@
         {"Message", msg},
         {"EntryType", "Oem"},
         {"Severity",
-         severity <= 2 ? "Critical"
-                       : severity <= 4 ? "Warning" : severity <= 7 ? "OK" : ""},
+         severity <= 2 ? "Critical" : severity <= 4 ? "Warning" : "OK"},
         {"OemRecordFormat", "BMC Journal Entry"},
         {"Created", std::move(entryTimeStr)}};
     return 0;