oc-rtf: no color table definition

Be able to parse rtf files without color table defined
\colortbl

OpenChange/RTFHandler.m

@@ -824,19 +824,19 @@ const unsigned short ansicpg874[256] = {
               int color_index;
               char *v;
 
+              if (!formattingOptions) continue;
+
               color_index = [[s substringFromIndex: 2] intValue];
-             
- 	      if (!formattingOptions)
-		continue;
- 
-              if (formattingOptions->color_index >= 0) // && color_index != formattingOptions->color_index)
+              colorDef = [colorTable colorDefAtIndex: color_index];
+              if (!colorDef) continue;
+
+              if (formattingOptions->color_index >= 0)
                 {
                   [_html appendBytes: "</font>"  length: 7];
                 }
-              
-              formattingOptions->color_index = color_index;              
-              colorDef = [colorTable colorDefAtIndex: color_index];
-              
+
+              formattingOptions->color_index = color_index;
+
               v = malloc(23*sizeof(char));
               memset(v, 0, 23);
               sprintf(v, "<font color=\"#%02x%02x%02x\">", colorDef->red, colorDef->green, colorDef->blue);