Issue paquettg#115 fixed and test added

Author: paquettg

src/PHPHtmlParser/Dom.php

@@ -748,6 +748,7 @@ protected function parseTag(): array
         }
 
         $this->content->skipByToken('blank');
+        $tag = strtolower($tag);
         if ($this->content->char() == '/') {
             // self closing tag
             $node->getTag()->selfClosing();

src/PHPHtmlParser/Dom/HtmlNode.php

@@ -201,7 +201,7 @@ protected function clear(): void
         $this->text      = null;
         $this->textWithChildren = null;
 
-        if (is_null($this->parent) === false) {
+        if (!is_null($this->parent)) {
             $this->parent->clear();
         }
     }

tests/Options/StrictTest.php

@@ -53,4 +53,14 @@ public function testConfigStrictMissingAttribute()
             $this->assertEquals("Tag 'p' has an attribute 'block' with out a value! (character #22)", $e->getMessage());
         }
     }
+
+    public function testConfigStrictBRTag()
+    {
+        $dom = new Dom;
+        $dom->setOptions([
+          'strict' => true,
+        ]);
+        $dom->load('<br />');
+        $this->assertTrue(true);
+    }
 }