#213: fix init context npe (#214)

* #213: quickfix for NPE
* also delete obsolete devon.properties

Author: hohwille

cli/src/main/java/com/devonfw/tools/ide/cli/Ideasy.java

@@ -104,7 +104,7 @@ private AbstractIdeContext initContext(CliArguments arguments) {
         if (property instanceof FlagProperty) {
           ((FlagProperty) property).setValue(Boolean.TRUE);
         } else {
-          this.context.error("Missing value for option {}", key);
+          System.err.println("Missing value for option " + key);
         }
       } else {
         property.setValueAsString(value, this.context);