title: Oracle - drop synonym IF EXISTS
body: <p>Using MSSQL - I can drop synonym only if it exist:
  <a href="https://msdn.microsoft.com/en-us/library/ms174996.aspx" rel="nofollow noreferrer">DROP SYNONYM (Transact-SQL)</a></p>
  
  <p>But in Oracle (11g) drop synonym causes my script to error if it doesn't exit, is there a way to mimic the MSSQL it exist?</p>