Fix missing exception when $magickBinaryPath fails

Author: Pierstoval

src/Command.php

@@ -111,13 +111,17 @@ public static function findMagickBinaryPath(?string $magickBinaryPath): string
             $magickBinaryPath = (new ExecutableFinder())->find('magick');
         }
 
+        if (!$magickBinaryPath) {
+            throw new MagickBinaryNotFoundException($magickBinaryPath);
+        }
+
         // Add a proper directory separator at the end if path is not empty.
         // If it's empty, then it's set in the global path.
-        if ($magickBinaryPath && !\is_file($magickBinaryPath)) {
+        if (!\is_file($magickBinaryPath)) {
             throw new MagickBinaryNotFoundException($magickBinaryPath);
         }
 
-        if ($magickBinaryPath && !\is_executable($magickBinaryPath)) {
+        if (!\is_executable($magickBinaryPath)) {
             throw new \InvalidArgumentException(\sprintf('The specified script (%s) is not executable.', $magickBinaryPath));
         }