Fix reading environement variables

Author: blootsvoets

src/main/java/org/radarbase/output/accounting/OffsetIntervals.kt

@@ -73,7 +73,7 @@ class OffsetIntervals {
 
     fun add(range: OffsetRangeSet.Range) {
         val (from, to, lastModified) = range
-        checkNotNull(to)
+        checkNotNull(to) { "Cannot add OffsetRange if the `to` value is missing." }
         var index = offsetsFrom.binarySearch(from)
         if (index < 0) {
             // index where this range would be entered
@@ -143,7 +143,7 @@ class OffsetIntervals {
 
     fun remove(range: OffsetRangeSet.Range) {
         val (from, to, _) = range
-        checkNotNull(to)
+        checkNotNull(to) { "Cannot add OffsetRange if the `to` value is missing." }
 
         var index = offsetsFrom.binarySearch(from)
 

src/main/java/org/radarbase/output/config/RestructureConfig.kt

@@ -81,7 +81,10 @@ data class RestructureConfig(
         inline fun <T> T.copyEnv(key: String, doCopy: T.(String) -> T): T =
             copyOnChange<T, String?>(
                 null,
-                modification = { System.getenv(key).takeIf { it.isNotEmpty() } },
+                modification = {
+                    System.getenv(key)
+                        ?.takeIf { it.isNotEmpty() }
+               },
                 doCopy = { doCopy(requireNotNull(it) { "Environment variable $key is empty" }) },
             )