buildSearchableOptions fails on MacOS

[DreierF]

Running the buildSearchableOptions task on MacOS fails with the following error message on 1.0

Execution failed for task ':myProject:buildSearchableOptions'.
> Failed to query the value of task ':myProject:buildSearchableOptions' property 'projectExecutable'.
   > Array contains no element matching the predicate.

It fails here:
https://github.com/JetBrains/gradle-intellij-plugin/blob/55443b8651ad436eff70d6b3907cfd24f57e4f9c/src/main/kotlin/org/jetbrains/intellij/jbr/JbrResolver.kt#L101

AFAICS this should be

        val jbr = javaHome.listFiles()?.firstOrNull { it.name == "jbr" || it.name == "jbrsdk" }

instead as the following code explicitly handles the null case for MacOS.