Make sure for image resource url enabled index image pixel size fields are filled

if at least one of the image size fields is enabled in index (images_height_val,
images_width_val, images_pixel_val). 
Previously all fields were required to be enabled (hint: default setting 
is height + width enabled)

source/net/yacy/search/schema/CollectionConfiguration.java

@@ -913,24 +913,28 @@ public class CollectionConfiguration extends SchemaConfiguration implements Seri
 
         // handle image source meta data
         if (document.getContentDomain() == ContentDomain.IMAGE) {
-            // add image pixel size if known
-            Iterator<ImageEntry> imgit = document.getImages().values().iterator();
-            List<Integer> heights = new ArrayList<>();
-            List<Integer> widths = new ArrayList<>();
-            List<Integer> pixels = new ArrayList<>();
-            while (imgit.hasNext()) {
-                ImageEntry img = imgit.next();
-                int imgpixels = (img.height() < 0 || img.width() < 0) ? -1 : img.height() * img.width();
-                if (imgpixels > 0 && (allAttr || (contains(CollectionSchema.images_height_val) && contains(CollectionSchema.images_width_val) && contains(CollectionSchema.images_pixel_val)))) {
-                    heights.add(img.height());
-                    widths.add(img.width());
-                    pixels.add(imgpixels);
+            // add image pixel sizes if enabled in index
+            // get values if as least one of the size fields is enabled in index
+            if (allAttr || (contains(CollectionSchema.images_height_val) || contains(CollectionSchema.images_width_val)) || contains(CollectionSchema.images_pixel_val)) {
+                // add image pixel size if known
+                Iterator<ImageEntry> imgit = document.getImages().values().iterator();
+                List<Integer> heights = new ArrayList<>();
+                List<Integer> widths = new ArrayList<>();
+                List<Integer> pixels = new ArrayList<>();
+                while (imgit.hasNext()) {
+                    ImageEntry img = imgit.next();
+                    int imgpixels = (img.height() < 0 || img.width() < 0) ? -1 : img.height() * img.width();
+                    if (imgpixels > 0) {
+                        heights.add(img.height());
+                        widths.add(img.width());
+                        pixels.add(imgpixels);
+                    }
+                }
+                if (heights.size() > 0) { // add to index document
+                    add(doc, CollectionSchema.images_height_val, heights); // add() checks if field is enabled in index
+                    add(doc, CollectionSchema.images_width_val, widths);
+                    add(doc, CollectionSchema.images_pixel_val, pixels);
                 }
-            }
-            if (heights.size() > 0) {
-                add(doc, CollectionSchema.images_height_val, heights);
-                add(doc, CollectionSchema.images_width_val, widths);
-                add(doc, CollectionSchema.images_pixel_val, pixels);
             }
 
             if (allAttr || contains(CollectionSchema.images_text_t))  {

source/net/yacy/search/schema/CollectionSchema.java

@@ -161,7 +161,7 @@ public enum CollectionSchema implements SchemaDeclaration {
     images_alt_sxt(SolrType.string, true, true, true, false, true, "all image link alt tag"), // no need to index this; don't turn it into a txt field; use images_text_t instead
     images_height_val(SolrType.num_integer, true, true, true, false, false, "size of images:height"),
     images_width_val(SolrType.num_integer, true, true, true, false, false, "size of images:width"),
-    images_pixel_val(SolrType.num_integer, true, true, true, false, false, "size of images as number of pixels (easier for a search restriction than with and height)"),
+    images_pixel_val(SolrType.num_integer, true, true, true, false, false, "size of images as number of pixels (easier for a search restriction than width and height)"),
     images_withalt_i(SolrType.num_integer, true, true, false, false, false, "number of image links with alt tag"),
     htags_i(SolrType.num_integer, true, true, false, false, false, "binary pattern for the existance of h1..h6 headlines"),
     canonical_s(SolrType.string, true, true, false, false, false, "url inside the canonical link element"),