No error message when comparing int with bool

[mgrijalva]

The following file will not throw an error. The comparison will fail (so "if passed" will not display) but there is no error message about the invalid comparison.

<tile>
    <var>
        <name>count</name>
        <value>4</value>
    </var>
    <var>
        <name>is_alive</name>
        <value>true</value>
    </var>
    <text>Hello world</text>
    <if arg1="count" arg2="is_alive" comparison="eq">
        <text>if passed</text>
    </if>
    <link>
        <file>start.xml</file>
        <text>Move forward</text>
    </link>
</tile>

This will throw a proper error (bool then int)

<if arg1="is_alive" arg2="count" comparison="eq"></if>

So just the int first, bool second case needs to be updated.