[BUGFIX] Minor bugfixes and optimisations

- Fixed getRoute sometimes not passing current loaded route.
- Fixed optional parameters in some occasions not working properly.

src/Pecee/SimpleRouter/RouterEntry.php

@@ -278,7 +278,7 @@ abstract class RouterEntry {
 
                 if($lastCharacter === '?') {
                     $parameter = substr($parameter, 0, strlen($parameter)-1);
-                    $regex .= '\\/?(?P<'.$parameter.'>[^\/]*)\\/?';
+                    $regex .= '\\/(?:(?P<'.$parameter.'>[^\/]*)\\/?)';
                     $required = false;
                 } else {
                     $regex .= '\\/(?P<' . $parameter . '>'. $parameterRegex .')\\/';
@@ -314,6 +314,10 @@ abstract class RouterEntry {
                         throw new RouterException('Missing required parameter ' . $name['name'], 404);
                     }
 
+                    if(!$name['required'] && $parameterValue === null) {
+                        continue;
+                    }
+
                     $parameters[$name['name']] = $parameterValue;
                 }
             }