add ISBLANK to an IFERROR formula

Hi to return "trimmed" telephone numbers from a database I have devised this

=IFERROR("0"&RIGHT(VLOOKUP($H3,DriverGrid_20052016_110032.xls!$C$1:$F$54,2),10),"")

works fine and displays nothing if lookup cell for name is empty

How can I add ISBLANK so that if cell in C1:f54 is blank then display nothing rather than the zero displayed now

Any help appreciated

Try

=IFERROR(IF(RIGHT(VLOOKUP($H3,DriverGrid_20052016_110032.xls!$C$1:$F$54,2),10)="","","0"&RIGHT(VLOOKUP($H3,DriverGrid_20052016_110032.xls!$C$1:$F$54,2),10)),"")