[WW-4848] The if test can accidently incorrectly assign a new value to an object - ASF JIRA

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The s:if tag has the side effect of assigning to an existing object
if the comparison is badly formed using = instead of ==

<s:if test="user.id = 0">  
  //at this point the user.id is now 0 not its original value
</s:if>

even though this is clearly badly formed, the test should not assign anything to the object

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The if test can accidently incorrectly assign a new value to an object