--- loncom/homework/caparesponse/caparesponse.pm	2000/12/05 22:07:26	1.17
+++ loncom/homework/caparesponse/caparesponse.pm	2000/12/08 20:53:45	1.18
@@ -34,19 +34,21 @@ sub end_caparesponse {
       $Apache::caparesponse::result='';
       $safeeval->share_from('capa',['&caparesponse_capa_check_answer']);
       my $response = $ENV{'form.HWVAL'.$Apache::inputtags::curvalue};
-      $Apache::lonhomework::results{"resource.submission.$Apache::inputtags::part.$Apache::inputtags::response['-1']"}=$response;
-    &Apache::lonxml::debug("submitted a $response<br>\n");
-      &Apache::lonxml::debug($$parstack[$#$parstack] . "\n<br>");
-      my $expression="&caparesponse_check('".$response."','".
-	$$parstack[$#$parstack].
-	  ';my $tol="'.$Apache::inputtags::params{'tol'}.'"'.
-	    ';my $sig="'.$Apache::inputtags::params{'sig'}.'"'.
-	      "');";
-      $result = &Apache::run::run($expression,$safeeval);
-      my ($ad) = split /:/ , $result;
-      $Apache::lonhomework::results{"resource.awarddetail.$Apache::inputtags::part.$Apache::inputtags::response['-1']"}=$ad;
-      &Apache::lonxml::debug("$expression");
-      &Apache::lonxml::debug("\n<br>result:$Apache::caparesponse::result:$result:$Apache::lonxml::curdepth<br>\n");
+      if ( $response =~ /[^\s]/) {
+	$Apache::lonhomework::results{"resource.submission.$Apache::inputtags::part.$Apache::inputtags::response['-1']"}=$response;
+	&Apache::lonxml::debug("submitted a $response<br>\n");
+	&Apache::lonxml::debug($$parstack[$#$parstack] . "\n<br>");
+	my $expression="&caparesponse_check('".$response."','".
+	  $$parstack[$#$parstack].
+	    ';my $tol="'.$Apache::inputtags::params{'tol'}.'"'.
+	      ';my $sig="'.$Apache::inputtags::params{'sig'}.'"'.
+		"');";
+	$result = &Apache::run::run($expression,$safeeval);
+	my ($ad) = split /:/ , $result;
+	$Apache::lonhomework::results{"resource.awarddetail.$Apache::inputtags::part.$Apache::inputtags::response['-1']"}=$ad;
+	&Apache::lonxml::debug("$expression");
+	&Apache::lonxml::debug("\n<br>result:$Apache::caparesponse::result:$result:$Apache::lonxml::curdepth<br>\n");
+      }
     }
   } else {
     #$result .= "The correct answer is ".&Apache::run::run("{$$parstack['-1'];".'return $answer}',$safeeval)."\n";