writeln if not empty

[Timothee Cour]

Is there a way to do the following lazily:

writelnIfNotEmpty(T)(T a){
auto b=text(a);
if(b.length)
  writeln(b);
}

ie, without using std.conv.text (which needlessly computes an intermediate
string, which could be quite large) or launching a separate process ?

writelnIfNotEmpty(""); //doesn't print new line
writelnIfNotEmpty("a"); //prints "a\n"
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