Output of unknown xml/html tag

When having a problem like:
```
/** \file

- Just name <name>
- name plus subname <name subname>
- name plus twice subname <name subname subname>
- name plus subname subname="" <name subname subname="">
 */
```
we get correctly the warnings:
```
.../aa.h:3: warning: Unsupported xml/html tag <name> found
.../aa.h:4: warning: Unsupported xml/html tag <name> found
.../aa.h:5: warning: Unsupported xml/html tag <name> found
.../aa.h:6: warning: Unsupported xml/html tag <name> found
```
but the output doesn't look good as there is `=""` added:
```
    Just name <name>
    name plus subname <name subname="">
    name plus twice subname <name subname="" subname="">
    name plus subname subname="" <name subname="" subname="">
```

This patch fixes this output.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/doctokenizer.h b/src/doctokenizer.h
index f89069c..e95c4c0 100644
--- a/src/doctokenizer.h
+++ b/src/doctokenizer.h
@@ -100,6 +100,7 @@ struct TokenInfo
   HtmlAttribList attribs;
   bool endTag;
   bool emptyTag;
+  QCString attribsStr;
 
   // whitespace
   QCString chars;