improve exception handling

toolflow/src/main/scala/com/minres/tgc/hammer/Main.scala

@@ -2,6 +2,7 @@ package com.minres.tgc.hammer
 
 import ch.qos.logback.classic.Level
 import com.minres.tgc.hammer.cli.{HammerConf, MySubcommand}
+import com.minres.tgc.hammer.util.AssertException
 import com.typesafe.scalalogging.Logger
 import org.slf4j.LoggerFactory
 
@@ -36,8 +37,11 @@ object Main {
         try {
           tasks.foreach(_.run())
         } catch {
-          case e: Exception =>
+          case e: AssertException =>
             logger.error(s"Error during task execution, see above!")
+          case e: Exception =>
+            logger.error(s"General exception ${e.getMessage}")
+            e.printStackTrace()
         }
       case _ =>
         logger.error(s"Found no subcommand, see help below")