Fixed that candidateHost may is null

ui/BankingUiCommon/src/jvmMain/kotlin/net/dankito/banking/util/BankIconFinder.kt

@@ -214,7 +214,9 @@ open class BankIconFinder : IBankIconFinder {
             val candidateUri = URI.create(urlCandidate.replace("onlinebanking-", ""))
             val candidateHost = candidateUri.host
 
+            if (candidateHost != null) {
                 return bankNameParts.filter { part -> candidateHost.contains(part, true) }.size
+            }
         } catch (e: Exception) {
             log.warn("Could not find host of url '$urlCandidate' in bank name $bankNameParts'", e)
         }