Add a special case for emphasis in line charts

[uhafner]

Line charts should disable the emphasis, it makes no sense there.

[github-actions]

☀️   Quality Monitor

Tests

     Unit Tests: No test results available
   🚀   Integration tests: 100% successful (15 passed)
   ⛔   Architecture tests: No test results available

Code Coverage

   〰️   Line Coverage: 50% (53 missed lines)
   ➰   Branch Coverage: 50% (6 missed branches)

Style

     CheckStyle: No warnings
     PMD: No warnings

Bugs

     SpotBugs: No bugs

Vulnerabilities

     OWASP Dependency Check: 172 vulnerabilities (error: 15, high: 45, normal: 108, low: 4)

Software Metrics

   🌀   Cyclomatic Complexity: 51 (total)
   💭   Cognitive Complexity: 7 (total)
   ➿   N-Path Complexity: 49 (total)
   📏   Lines of Code: 662 (total)
   📝   Non Commenting Source Statements: 156 (total)
   🔗   Class Cohesion: 100.00% (maximum)
   ⚖️   Weight of Class: 100.00% (maximum)

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🚧   Error Messages

Quality Monitor Errors:
No matching report files found when using pattern '**/target/surefire-reports/TEST*util*.xml'! Configuration error for 'Unit Tests'?
No matching report files found when using pattern '**/target/surefire-reports/TEST*archunit*.xml'! Configuration error for 'Architecture tests'?

Created by Quality Monitor v2.5.3 (#8fa0834). More details are shown in the GitHub Checks Result.