Improve table auto layout in case empty cells with fixed table width

DEVSIX-1195

Author: pavel-alay

layout/src/main/java/com/itextpdf/layout/renderer/TableWidths.java

@@ -414,18 +414,23 @@ float[] autoLayout() {
                         } else {
                             float totalFixed = 0;
                             float totalFlexible = 0;
+                            float flexibleCount = 0;
                             for (int i = 0; i < numberOfColumns; i++) {
                                 if (widths[i].isFixed) {
                                     widths[i].finalWidth = widths[i].width;
                                     totalFixed += widths[i].width;
                                 } else if (!widths[i].isPercent) {
                                     totalFlexible += widths[i].width;
+                                    flexibleCount++;
                                 }
                             }
+                            assert totalFlexible > 0 || flexibleCount > 0;
                             extraWidth = tableWidth - totalPercent - totalFixed;
                             for (int i = 0; i < numberOfColumns; i++) {
                                 if (!widths[i].isPercent && !widths[i].isFixed) {
-                                    widths[i].finalWidth = widths[i].width * extraWidth / totalFlexible;
+                                    widths[i].finalWidth = totalFlexible > 0
+                                            ? widths[i].width * extraWidth / totalFlexible
+                                            : extraWidth / flexibleCount;
                                 }
                             }
                         }