function isUnmodifiedAndNotBelongToGroup(condition) {
	return !(condition.modified || condition.group);
}
Checks whether or not a given loop condition info does not have the modified
flag and does not have the group this condition belongs to.
@param {LoopConditionInfo} condition A loop condition info to check.
@returns {boolean} `true` if the loop condition info is "unmodified".