Conditional formatting needs to ignore blank spaces

Hello everyone. Thank you for reading and helping if you are.

I need to accomplish the following I have used a conditional formatting formula =$E1=$A$1. that uses search box in A1 to look for words in column and then highlights the entire row that word is in. In this case it is aircraft registrations.

if I don't have something written in the search box in A1 the selected area is highlighted that does not have any data in.

Can someone please help me to have my formula ignore all blank areas when there is nothing written in A1

Good morning Mr Dibbins. Dit gaan baaie goed met my en met jou :-)

OK so basically I just add that after the initial rule? Will try that and let you know. Thank you for the help. I see my typing is much better at 09 in the morning than at night.

OK I added that to the existing line but all it does is highlight line 1 and 2 when there is nothing typed in A1

Guys what can I say thank you so very very very much

Baie dankie Dibbins :-)