fix(createReport): early return on cancel in prompt

[Billuc]

Context

The createReportDialogPrompt is used to store/export DICOM SEGs. Currently, data is stored whether one click on 'Save' or 'Cancel'. The desired behaviour is that nothing happens if the "Cancel" button is clicked;

Changes & Results

• Fixed a condition for an early return in storeSegmentation (the function that creates the report)
• Added an early return in createReportAsync if no report has been created

Testing

• Open OHIF in segmentation mode (ex: https://viewer.ohif.org/segmentation?StudyInstanceUIDs=1.3.12.2.1107.5.2.32.35162.30000015050317233592200000046)
• Click "Add segmentation"
• Click on the "..." on the left of the segmentation name
• Click on "Export DICOM SEG"
• Click on "Cancel"
• There shouldn't be a notification indicating a success or failure

Checklist

PR

• My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• OS: Fedora 40
• Node version: 18.20.3
• Browser: Chromium Version 126.0.6478.55 (Official Build) Fedora Project (64-bit)

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