fix: make table fields show a '-' instead of an empty string when the

col content is null

fix: make all notifications fields optional

fix: make the notifications overrides fields valid only if the machine/
cryptocurrency and at least one of the other options are filled

new-lamassu-admin/src/components/editableTable/Row.js

@@ -103,7 +103,7 @@ const ECol = ({
     textAlign,
     suffix,
     SuffixComponent = TL2,
-    view = it => it?.toString(),
+    view = it => (!it ? '-' : it.toString()),
     inputProps = {}
   } = config