Do not allow empty inline tags

lib/core/processors/inline_tags.dart

@@ -26,7 +26,10 @@ class InlineTagsProcessor {
 
         var all = tag.split(prefix);
         for (var t in all) {
-          tags.add(t.trim());
+          t = t.trim();
+          if (t.isNotEmpty) {
+            tags.add(t);
+          }
         }
       }
     }

test/processors/inline_tags_test.dart

@@ -56,4 +56,84 @@ void main() {
 
     expect(tags, {'one', 'two', 'foo', 'doo'});
   });
+
+  test('Should Ignore headers', () {
+    var body = "# Hi\nHow are you?";
+
+    var p = InlineTagsProcessor(tagPrefixes: {'#', '+', '@'});
+    var tags = p.extractTags(body);
+
+    expect(tags.isEmpty, true);
+  });
+
+  test('Markdown Example', () {
+    var body = """# Markdown Example
+Markdown allows you to easily include formatted text, images, and even formatted Dart code in your app.
+
+## Titles
+
+Setext-style
+
+This is an H1 =============  This is an H2 -------------
+
+Atx-style
+
+# This is an H1  ## This is an H2  ###### This is an H6
+
+Select the valid headers:
+
+- [x] # hello
+- [ ] #hello
+
+## Links
+
+[Google's Homepage][Google]
+
+[inline-style](https://www.google.com)  [reference-style][Google]
+
+## Images
+
+
+
+## Tables
+
+|Syntax                                 |Result                               |
+|---------------------------------------|-------------------------------------|
+|*italic 1*                           |italic 1                           |
+|_italic 2_                           | italic 2                          |
+|**bold 1**                           |bold 1                           |
+|__bold 2__                           |bold 2                           |
+|This is a ~~strikethrough~~          |This is a strikethrough          |
+|***italic bold 1***                  |italic bold 1                  |
+|___italic bold 2___                  |italic bold 2                  |
+|***~~italic bold strikethrough 1~~***|***italic bold strikethrough 1***|
+|~~***italic bold strikethrough 2***~~|italic bold strikethrough 2|
+
+## Styling
+Style text as italic, bold, strikethrough, or inline code.
+
+- Use bulleted lists
+- To better clarify
+- Your points
+
+## Code blocks
+Formatted Dart code looks really pretty too:
+
+void main() {   runApp(MaterialApp(     home: Scaffold(       body: Markdown(data: markdownData),     ),   )); }
+
+## Markdown widget
+
+This is an example of how to create your own Markdown widget:
+
+    Markdown(data: 'Hello world!');
+
+Enjoy!
+
+[Google]: https://www.google.com/""";
+
+    var p = InlineTagsProcessor(tagPrefixes: {'#', '+', '@'});
+    var tags = p.extractTags(body);
+
+    expect(tags, {'hello'});
+  });
 }