Hotfix: Use array_key_exists, because isset will return false on null

Author: ovr

src/LaravelTrait.php

@@ -30,7 +30,7 @@ public function makeRequestByOperation(Operation $operation, array $parameters =
 
         if ($operation->parameters) {
             foreach ($operation->parameters as $parameter) {
-                if (isset($parameters[$parameter->name])) {
+                if (array_key_exists($parameter->name, $parameters)) {
                     switch ($parameter->in) {
                         case 'path':
                             $path = str_replace('{' . $parameter->name . '}', $parameters[$parameter->name], $path);

src/SlimTrait.php

@@ -31,7 +31,7 @@ public function makeRequestByOperation(Operation $operation, array $parameters =
 
         if ($operation->parameters) {
             foreach ($operation->parameters as $parameter) {
-                if (isset($parameters[$parameter->name])) {
+                if (array_key_exists($parameter->name, $parameters)) {
                     switch ($parameter->in) {
                         case 'path':
                             $path = str_replace('{' . $parameter->name . '}', $parameters[$parameter->name], $path);

src/SymfonyTrait.php

@@ -31,7 +31,7 @@ public function makeRequestByOperation(Operation $operation, array $parameters =
 
         if ($operation->parameters) {
             foreach ($operation->parameters as $parameter) {
-                if (isset($parameters[$parameter->name])) {
+                if (array_key_exists($parameter->name, $parameters)) {
                     $parameterValue = $parameters[$parameter->name];
                     if ($parameter->enum && !($options & SwaggerWrapper::SKIP_ENUM_CHECK)) {
                         if (!in_array($parameterValue, $parameter->enum)) {

src/ZendTrait.php

@@ -30,7 +30,7 @@ public function makeRequestByOperation(Operation $operation, array $parameters =
 
         if ($operation->parameters) {
             foreach ($operation->parameters as $parameter) {
-                if (isset($parameters[$parameter->name])) {
+                if (array_key_exists($parameter->name, $parameters)) {
                     switch ($parameter->in) {
                         case 'header':
                             $request->getHeaders()->addHeaderLine($parameter->name, $parameters[$parameter->name]);