IndexOutOfBoundsException while analyzing an empty Shell script

[begarco]

Describe the bug
i-Code throws an IndexOutOfBoundsException while analyzing an empty Shell script.

To reproduce
Run i-Code on an empty Shell file.

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots & log

ERROR: Internal i-Code error: exception [IndexOutOfBoundsException] thrown while checking [COM.PRES.Header] on file [/home/begarco/workspace/dotvimconfig/internal/colorscheme/colors/bim.sh] - Index: 0, Size: 0
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
        at java.util.LinkedList.checkElementIndex(LinkedList.java:555)
        at java.util.LinkedList.get(LinkedList.java:476)
        at fr.cnes.icode.shell.rules.COMPRESHeader.raiseErrors(COMPRESHeader.java:330)
        at fr.cnes.icode.shell.rules.COMPRESHeader.run(COMPRESHeader.java:716)
        at fr.cnes.sonar.plugins.icode.check.ICodeSensor.sonarCheck(ICodeSensor.java:273)
        at fr.cnes.sonar.plugins.icode.check.ICodeSensor.executeEmbeddedICode(ICodeSensor.java:193)
        at fr.cnes.sonar.plugins.icode.check.ICodeSensor.execute(ICodeSensor.java:116)

User environment (please complete the following information):

• OS: Ubuntu
• Java version: 11
• i-Code version: 4.0.0

Additional context
Run on plugin for SonarQube.