Omitting a condition and omitting its answer are distinct phenomena. In the first case the condition is understood from what remains; in the second the condition is stated but the consequent is suppressed.
TypeWhat is statedWhat is inferred
Omitted conditionResponse or its effectThe hypothetical premise
Omitted answerThe conditionIts consequent
A reconstruction must be warranted by conditional syntax and the discourse setting; not every sentence is elliptical in this way.