ConfigManager should check for empty value before converting into a specific 
type
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                 Key: FELIX-662
                 URL: https://issues.apache.org/jira/browse/FELIX-662
             Project: Felix
          Issue Type: Bug
          Components: Web Console
    Affects Versions: webconsole-1.0.0
            Reporter: Carsten Ziegeler


When a field for a property of a non-type is left empty in the web console, the 
empty string is tried to be converted into the type, which results in an 
exception.
One example is in the ConfigManager#648:
                        // scalar of non-string
                        String prop = request.getParameter( propName );
                        props.put( propName, this.toType( ad.getType(), prop ) 
);
The value should be checked before it is tried to be converted. There might be 
other places where this should be checked as well.

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