Fix For Load Factor and Variance Bug (#1002)

PR fixes the issue where load factor and variance being reported 0 to simbrief form, where user does not provide any values for each and wants to use general settings per flight.

Quick fix for issue #1001

resources/views/layouts/default/flights/simbrief_form.blade.php

@@ -3,12 +3,14 @@
 
 @section('content')
   @php
-    $loadmin = $flight->load_factor - $flight->load_factor_variance;
-    $loadmax = $flight->load_factor + $flight->load_factor_variance;
-    if($loadmin < 1) { $loadmin = 1; }
+    if($flight->load_factor) { $lfactor = $flight->load_factor ;} else { $lfactor = setting('flights.default_load_factor') ;}
+    if($flight->load_factor_variance) { $lfactorv = $flight->load_factor_variance ;} else { $lfactorv = setting('flights.load_factor_variance') ;}
+    $loadmin = $lfactor - $lfactorv ;
+    $loadmax = $lfactor + $lfactorv ;
+    if($loadmin < 0) { $loadmin = 0; }
     if($loadmax > 100) { $loadmax = 100; }
   @endphp
-
+  
   @foreach($aircraft as $acdetails)
     @php
       $simbrieftype = $acdetails->icao ;