Add newline if missing to end of script magic cell

IPython/core/magics/script.py

@@ -193,6 +193,8 b' class ScriptMagics(Magics):'
             else:
                 raise
         
+        if not cell.endswith('\n'):
+            cell += '\n'
         cell = cell.encode('utf8', 'replace')
         if args.bg:
             self.bg_processes.append(p)