Wrap NumberFormatException into IllegalStateException (#170)

Author: fsteeg

metafix/src/main/java/org/metafacture/metafix/FixPath.java

@@ -238,7 +238,12 @@ private void removeNestedFrom(final Value value) {
                     array.add(newValue);
                 }
                 else {
-                    mode.apply(array, field, newValue);
+                    try {
+                        mode.apply(array, field, newValue);
+                    }
+                    catch (final NumberFormatException e) {
+                        throw new IllegalStateException("Expected Hash, got Array", e);
+                    }
                 }
             }
         }

metafix/src/test/java/org/metafacture/metafix/MetafixMethodTest.java

@@ -330,7 +330,7 @@ public void shouldNotTrimIndexedArray() {
     @Test
     // See https://github.com/metafacture/metafacture-fix/pull/133
     public void shouldNotTrimStringInImplicitArrayOfHashes() {
-        MetafixTestHelpers.assertExecutionException(NumberFormatException.class, "For input string: \"title\"", () ->
+        MetafixTestHelpers.assertExecutionException(IllegalStateException.class, "Expected Hash, got Array", () ->
             MetafixTestHelpers.assertFix(streamReceiver, Arrays.asList(
                     "trim('data.title')"
                 ),