Use single task for empty javadocs.

libraries/stdlib/common/build.gradle

@@ -41,19 +41,8 @@ jar {
 }
 
 
-// TODO: use dokka instead?
-javadoc {
-    failOnError = false
-}
-
 task sourcesJar(type: Jar, dependsOn:classes) {
     classifier = 'sources'
     from sourceSets.main.kotlin
 
 }
-
-task javadocJar(type: Jar, dependsOn:javadoc) {
-    classifier = 'javadoc'
-    from javadoc.destinationDir
-}
-

libraries/stdlib/js/build.gradle

@@ -203,16 +203,6 @@ task sourcesJar(type: Jar, dependsOn: classes) {
 }
 
 
-task emptyJavadoc(type: Javadoc) {
-    source = sourceSets.main.java
-    failOnError = false
-}
-
-task javadocJar(type: Jar, dependsOn: emptyJavadoc) {
-    classifier = 'javadoc'
-    from emptyJavadoc.destinationDir
-}
-
 artifacts {
     runtime mergedJar
     archives mergedJar