Don't call .''() useless; it's merely inadvisable

Author: TimToady

STD.pm6

@@ -3422,7 +3422,7 @@ grammar P6 is STD {
             [ <!{$*QSIGIL}> || <!before '"' <-["]>*? \s > ] # dwim on "$foo."
             <quote>
             [ <?before '(' | '.(' | '\\'> || <.obs('. to concatenate strings or to call a quoted method', '~ to concatenate, or if you meant to call a quoted method, please supply the required parentheses')> ]
-            { my $t = $<quote><nibble>.Str; $t ~~ /\W/ or $t ~~ /^(WHO|WHAT|WHERE|WHEN|WHY|HOW)$/ or $¢.worry("Useless use of quotes") }
+            { my $t = $<quote><nibble>.Str; $t ~~ /\W/ or $t eq '' or $t ~~ /^(WHO|WHAT|WHERE|WHEN|WHY|HOW)$/ or $¢.worry("Useless use of quotes") }
         ] <.unsp>? 
 
         :dba('method arguments')