Function existSimilarCondition

existSimilarCondition(condition, isUpdate?): boolean
JMap.Layer.DynamicFilter.existSimilarCondition

Returns true if the condition already exist for the layer.

It doesn't check the id of the condition, only the values.
Parameters
- condition: JDynamicFilterCondition
  The condition to verify
- Optional isUpdate: boolean
  tell if the check is for a creation or an update
Returns boolean
Throws
if condition is not correct

Example
```
// log in console a message if this condition already exist
if (!JMap.Layer.DynamicFilter.existSimilarCondition(myCondition)) {
 console.log("Same condition values already exist")
}
```