[WWcvs] webwork2: make sure there are answer blanks before printing

[Sam H. v. a. <we...@ma...>]

Log Message:
-----------
make sure there are answer blanks before printing \begin{itemize}. fixes 
bug #859.

Modified Files:
--------------
    webwork2/lib/WeBWorK/ContentGenerator:
        Hardcopy.pm

Revision Data
-------------
Index: Hardcopy.pm
===================================================================
RCS file: /webwork/cvs/system/webwork2/lib/WeBWorK/ContentGenerator/Hardcopy.pm,v
retrieving revision 1.66
retrieving revision 1.67
diff -Llib/WeBWorK/ContentGenerator/Hardcopy.pm -Llib/WeBWorK/ContentGenerator/Hardcopy.pm -u -r1.66 -r1.67
--- lib/WeBWorK/ContentGenerator/Hardcopy.pm
+++ lib/WeBWorK/ContentGenerator/Hardcopy.pm
@@ -813,11 +813,12 @@
 	print $FH $pg->{body_text};
 	
 	# write the list of correct answers is appropriate
-	if ($showCorrectAnswers && $MergedProblem->problem_id != 0) {
+	my @ans_entry_order = @{$pg->{flags}->{ANSWER_ENTRY_ORDER}};
+	if ($showCorrectAnswers && $MergedProblem->problem_id != 0 && @ans_entry_order) {
 		my $correctTeX = "\\par{\\small{\\it Correct Answers:}\n"
 			. "\\vspace{-\\parskip}\\begin{itemize}\n";
 		
-		foreach my $ansName (@{$pg->{flags}->{ANSWER_ENTRY_ORDER}}) {
+		foreach my $ansName (@ans_entry_order) {
 			my $correctAnswer = $pg->{answers}->{$ansName}->{correct_ans};
 			$correctTeX .= "\\item\\begin{verbatim}$correctAnswer\\end{verbatim}\n";
 			# FIXME: What about vectors (where TeX will complain about < and > outside of math mode)?