Merge pull request #281 from sbesson/scale_time_positive

Do not store zero time increment values in coordinateTransforms

Author: melissalinkert

src/main/java/com/glencoesoftware/bioformats2raw/Converter.java

@@ -2681,7 +2681,13 @@ private Quantity getScale(
       case 'z':
         return meta.getPixelsPhysicalSizeZ(seriesIndex);
       case 't':
-        return meta.getPixelsTimeIncrement(seriesIndex);
+        Quantity timeIncrement = meta.getPixelsTimeIncrement(seriesIndex);
+        if (timeIncrement != null && timeIncrement.value().doubleValue() > 0) {
+          return timeIncrement;
+        }
+        else {
+          return null;
+        }
       default:
         return null;
     }