Evoke an error if images are missing on html page

[rbri]

% migrated from trac

We have to do the same for missing css files.

All this resources are processed, if we safe an page. I think this is the right place to check this. But because Frank is working at the moment on the exception handling, i like to postpone this until Frank finished.

The check is already in the source but commented out (search for 'Ticket #42')

[rbri]

another situation; this problem is not visible in the report

    09:22:25   [wetator] FATAL [ main] (     HtmlUnitBrowser.java:  661) - Problem with window handling. Saving page failed!
    09:22:25   [wetator] java.lang.IllegalArgumentException: about:graypixel.gif is not supported, only about:blank is supported now.
    09:22:25   [wetator] 	at com.gargoylesoftware.htmlunit.WebClient.makeWebResponseForAboutUrl(WebClient.java:1078)
    09:22:25   [wetator] 	at com.gargoylesoftware.htmlunit.WebClient.loadWebResponse(WebClient.java:1202)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.ResponseStore.storeContentFromUrl(ResponseStore.java:190)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.XHtmlOutputter.writeAttributes(XHtmlOutputter.java:441)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.XHtmlOutputter.writeStartTag(XHtmlOutputter.java:304)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.XHtmlOutputter.writeSubNodes(XHtmlOutputter.java:276)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.XHtmlOutputter.writeSubNodes(XHtmlOutputter.java:278)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.XHtmlOutputter.writeSubNodes(XHtmlOutputter.java:278)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.XHtmlOutputter.writeSubNodes(XHtmlOutputter.java:278)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.XHtmlOutputter.writeSubNodes(XHtmlOutputter.java:278)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.XHtmlOutputter.writeSubNodes(XHtmlOutputter.java:278)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.XHtmlOutputter.writeSubNodes(XHtmlOutputter.java:278)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.XHtmlOutputter.writeSubNodes(XHtmlOutputter.java:278)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.XHtmlOutputter.writeTo(XHtmlOutputter.java:246)
    09:22:25   [wetator] 	at org.wetator.backend.htmlunit.XHtmlOutputter.writeTo(XHtmlOutputter.java:227)