fix(pictorialBar): symbol should not flip with zero data

[Ovilia]

Brief Information

This pull request is in the type of:

• [x] bug fixing
• [ ] new feature
• [ ] others

What does this PR do?

When data value is 0, there was a bug that the item symbols are flipped.

Fixed issues

#20260

Details

Before: What was the problem?

Symbol filpped.

After: How does it behave after the fixing?

Symbol not flipped.

Document Info

One of the following should be checked.

• [x] This PR doesn't relate to document changes
• [ ] The document should be updated later
• [ ] The document changes have been made in apache/echarts-doc#xxx

Misc

ZRender Changes

• [ ] This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

N.A.

Others

Merging options

• [ ] Please squash the commits into a single one when merging.

Other information