Corrected empty arguments recognized as numbers. Empty arguments are now ignored.

src/ee.c

@@ -21,6 +21,9 @@ main (const int argc, const char* argv[])
         else if (arrity(**arg))
             push(evaluate(&expr, **arg), &expr);
 
+        else if (strcmp(*arg, "") == 0)
+            // Ignore empty arguments
+            ;
         else
             error |= ERR_INVALID_INPUT;
 
@@ -49,7 +52,8 @@ isNum(const char* query)
 
     char *extra_char;
     strtod(query, &extra_char);
-    return strcmp(extra_char, "") == 0;
+    return (strcmp(query, "") != 0) &&
+           (strcmp(extra_char, "") == 0);
 
 }
 
@@ -138,9 +142,6 @@ operands(STACK* target_stack, int size)
      */
     double * const _operands = (double*)malloc(size*sizeof(double));
 
-    //#if ((*target_stack) == NULL)
-    //    error |= ERR_NS_OPERANDS;
-
     double * tPtr   = _operands;
     double * endPtr = _operands + size;
     while ((tPtr < endPtr) && !error)