Adobe forms-checking that required fields are completed-Java Script

I have inserted two Java Scripts into my form--one for checking for required fields are completed, and then one for generating an email pulling a custom subject line, as shown below:
var emptyFields = [];
for (var i=0; i<this.numFields; i++) {
     var f= this.getField(this.getNthFieldName(i));
     if (f.type!="button" && f.required && f.display==display.visible) {
          if ((f.type=="text" && f.value=="") || (f.type=="checkbox" && f.value=="Off")) emptyFields.push(f.name);
if (emptyFields.length>0) {
     app.alert("Error! You must fill in the following fields:\n" + emptyFields.join("\n"));
this.mailDoc({bUI:false,cTo:"[email protected],[email protected],[email protected]",cSubject:"Bugzilla Form for: "+this.getField("Bugzilla Title").value+" - "+this.getField("Bugzilla ID").value})
Issue: After the error window displays fields that have not been completed, when I click OK the email window displays.
QUESTION: How can I stop the email window from displaying until all fields are completed?
THANKS!

Thank you so much for your quick response (and thank you for all the code that I am reusing!) I have another issue now.Can you see why the following is occurring....
I placed else in and now it edits the required fields, but once they are completed, will not initiate the email prompt. Here's what I have now
var emptyFields = [];
for (var i=0; i<this.numFields; i++) {
     var f= this.getField(this.getNthFieldName(i));
     if (f.type!="button" && f.required && f.display==display.visible) {
          if ((f.type=="text" && f.value=="") || (f.type=="checkbox" && f.value=="Off")) emptyFields.push(f.name);
if (emptyFields.length>0) {
     app.alert("Error! You must fill in the following fields:\n" + emptyFields.join("\n"));
elsethis.mailDoc({bUI:false,cTo:"[email protected],[email protected],[email protected]",cSubject:"Bugzilla Form for: "+this.getField("Bugzilla Title").value+" - "+this.getField("Bugzilla ID").value})

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