fix assert(0) if CRC32 called with nothing in debug build

Author: gfwilliams

src/jsvariterator.c

@@ -774,7 +774,7 @@ void jsvIteratorNew(JsvIterator *it, JsVar *obj, JsvIteratorFlags flags) {
     jsvStringIteratorNew(&it->it.str, obj, 0);
   } else {
     it->type = JSVI_NONE;
-    assert(0);
+    assert(0); // getting here won't break anything, but it's good to be warned about it
   }
 }
 

src/jswrap_espruino.c

@@ -2033,6 +2033,7 @@ Perform a standard 32 bit CRC (Cyclic redundancy check) on the supplied data
 (one byte at a time) and return the result as an unsigned integer.
  */
 JsVar *jswrap_espruino_CRC32(JsVar *data) {
+  if (!jsvIsIterable(data)) return 0; // fix assert(0) if called with nothing in debug build
   JsvIterator it;
   jsvIteratorNew(&it, data, JSIF_EVERY_ARRAY_ELEMENT);
   uint32_t crc = 0xFFFFFFFF;