Just warn when local jacodb is not found

Author: Lipen

settings.gradle.kts

@@ -15,8 +15,11 @@ pluginManagement {
 // See IDEA bug: https://youtrack.jetbrains.com/issue/IDEA-329756
 val jacodbPath = file("jacodb").takeIf { it.exists() }
     ?: file("../jacodb").takeIf { it.exists() }
-    ?: error("Local JacoDB directory not found")
-includeBuild(jacodbPath.toPath().toRealPath().toAbsolutePath())
+if (jacodbPath != null) {
+    includeBuild(jacodbPath.toPath().toRealPath().toAbsolutePath())
+} else {
+    logger.warn("Local JacoDB directory not found")
+}
 
 val usvmPython = "usvm-python"
 fun includePy(name: String) {