FIX #3867 Fix first user in visa

visa/trunk/class/class_modules_tools_Abstract.php

@@ -546,7 +546,7 @@ abstract class visa_Abstract extends Database
 								$str .= '<td>';
 								$tab_users = $this->getUsersVis();
 
-								if ($isVisaStep && $myPosVisa >= $seq || $step['process_date'] != '')
+								if (($isVisaStep && $myPosVisa != null && $myPosVisa >= $seq) || ($step['process_date'] && $step['process_date'] != ''))
 									$disabled = ' disabled ';
 								else
 									$disabled = '';
@@ -580,11 +580,11 @@ abstract class visa_Abstract extends Database
 								$up = ' style="visibility:visible"';
 								$displayCB = ' style="visibility:hidden"';
 								$checkCB = '';
-								if ($isVisaStep && $myPosVisa >= $seq || $step['process_date'] != '')
+								if ($isVisaStep && $myPosVisa != null && $myPosVisa >= $seq || $step['process_date'] != '')
 									$down = ' style="visibility:hidden"';
 								else
 									$down = ' style="visibility:visible"';
-								if ($isVisaStep && $myPosVisa >= $seq || $step['process_date'] != '')
+								if ($isVisaStep && $myPosVisa != null && $myPosVisa >= $seq || $step['process_date'] != '')
 									$del = ' style="visibility:hidden"';
 								else
 									$del = ' style="visibility:visible"';