#63 the content assist inserts "null" when file is empty

[Anonymous]

When I insert a template in an empty file, using the <CTRL + SPACE> keystroke, it inserts a "null" word at each beginning of line.

It comes from the getIndentString function in net.sourceforge.veditor.document.HdlDocument, which returns null in this case.

A control on the return of this method should be done if I'm right. Or the method should simply return the empty string "" instead of a null string.