Bug 281126 [CSS] Illegal state exc from tab-height
If you just type a space in the CSS Editors SWT example you will get traces in the console failing on CSSValue.getFloatValue() for tab-height.
bundles/org.eclipse.e4.ui.css.core/src/org/eclipse/e4/ui/css/core/impl/dom/Measure.java
this.value = value;
	}
	/**
	 * Return a float representation of the receiver's value.
	 * @param valueType a short representing the value type, see {@link CSSValue#getCssValueType()}
	 */
	public float getFloatValue(short valueType) throws DOMException {
		
		
		
		if(value.getLexicalUnitType() == LexicalUnit.SAC_INTEGER)
			return value.getIntegerValue();
		
		
		return value.getFloatValue();
	}
	/**
	 * Return an int representation of the receiver's value.
	 * @param valueType a short representing the value type, see {@link CSSValue#getCssValueType()}
	 */
	public int getIntegerValue(short valueType) throws DOMException {
		return value.getIntegerValue();
	}
	/*
	 * (non-Javadoc)
	 * @see org.w3c.dom.css.CSSPrimitiveValue#getStringValue()
	 */
	public String getStringValue() throws DOMException {
		short lexicalUnit = value.getLexicalUnitType();
		if((lexicalUnit == LexicalUnit.SAC_IDENT)