Arjob Mukherjee

## Description `Invalid. There are more notes than highlights` is wrongly reported even when there is no issue in the Clippings.txt file. **Note:** Issue present in 0.9.0 and 0.10.0.

**Stack Trace:** ``` Exception :index -1, length 0 java.lang.StringIndexOutOfBoundsException: index -1, length 0 at java.base/java.lang.String.checkIndex(String.java:4560) at java.base/java.lang.AbstractStringBuilder.deleteCharAt(AbstractStringBuilder.java:970) at java.base/java.lang.StringBuilder.deleteCharAt(StringBuilder.java:298) at coderarjob.kpdfsync.lib.annotator.PdfAnnotatorV1.doHighlight(PdfAnnotatorV1.java:96) at coderarjob.kpdfsync.lib.annotator.PdfAnnotatorV1.highlight(PdfAnnotatorV1.java:65) at coderarjob.kpdfsync.poc.MainFrame$2.run(MainFrame.java:201) at java.base/java.lang.Thread.run(Thread.java:833) ```

**Book:** [https://plan9.io/sys/doc/lexnames.pdf](https://plan9.io/sys/doc/lexnames.pdf) **Stack Trace:** Exception :Cannot invoke "org.pdfclown.documents.contents.IContentContext.getContents()" because "contentContext" is null java.lang.NullPointerException: Cannot invoke "org.pdfclown.documents.contents.IContentContext.getContents()" because "contentContext" is null at org.pdfclown.documents.contents.ContentScanner.(ContentScanner.java:1033) at org.pdfclown.tools.TextExtractor.extract(TextExtractor.java:297) at coderarjob.kpdfsync.lib.annotator.PdfAnnotatorV1.highlight(PdfAnnotatorV1.java:62) at coderarjob.kpdfsync.poc.MainFrame$2.run(MainFrame.java:202) at java.base/java.lang.Thread.run(Thread.java:833)