[fix] Put mysql import in try,catch in case it hasn't been installed

salt/_modules/so.py

@@ -7,10 +7,15 @@ def status():
 
 
 def mysql_conn(retry):
-  from MySQLdb import _mysql
-  import time
-
     log = logging.getLogger(__name__)
+
+    try:
+        from MySQLdb import _mysql
+    except ImportError as e:
+        log.error(e)
+        return False
+    from time import sleep
+
     mainint = __salt__['pillar.get']('sensor:mainint', __salt__['pillar.get']('manager:mainint'))
     mainip = __salt__['grains.get']('ip_interfaces').get(mainint)[0]
 
@@ -30,7 +35,7 @@ def mysql_conn(retry):
         except Exception as e:
             log.error(e)
             break
-      time.sleep(1)
+        sleep(1)
 
     if not mysql_up:
         log.error(f'Could not connect to MySQL server on {mainip} after {retry} attempts.')