crash NPE affichage information participant dans le détail de certaines fiches (ex: daurade)

Imported issue: This issue was initially reported by @dvojtise in https://gforge.inria.fr/tracker/?func=detail&aid=21747 (Additionnal comments haven't been imported and may still be there)

lors de l'affichage de certaines fiches (comme la daurade)

on obtient le null pointeur suivant :

USER_COMMENT=null

ANDROID_VERSION=8.0.0

APP_VERSION_NAME=4.3

BRAND=samsung

PHONE_MODEL=SM-G955F

CUSTOM_DATA=

STACK_TRACE=java.lang.RuntimeException: Unable to resume activity {fr.ffessm.doris.android/fr.ffessm.doris.android.activities.DetailsFiche_ElementViewActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void fr.ffessm.doris.android.datamodel.Participant.setContextDB(fr.ffessm.doris.android.datamodel.DorisDBHelper)' on a null object reference

at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3788)

at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3828)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3036)

at android.app.ActivityThread.-wrap11(Unknown Source:0)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)

at android.os.Handler.dispatchMessage(Handler.java:105)

at android.os.Looper.loop(Looper.java:164)

at android.app.ActivityThread.main(ActivityThread.java:6938)

at java.lang.reflect.Method.invoke(Native Method)

at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void fr.ffessm.doris.android.datamodel.Participant.setContextDB(fr.ffessm.doris.android.datamodel.DorisDBHelper)' on a null object reference

at fr.ffessm.doris.android.activities.DetailsFiche_ElementViewActivity.refreshScreenData(DetailsFiche_ElementViewActivity.java:383)

at fr.ffessm.doris.android.activities.DetailsFiche_ElementViewActivity.onResume(DetailsFiche_ElementViewActivity.java:204)

at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1361)

at android.app.Activity.performResume(Activity.java:7353)

at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3763)

... 10 more

java.lang.NullPointerException: Attempt to invoke virtual method 'void fr.ffessm.doris.android.datamodel.Participant.setContextDB(fr.ffessm.doris.android.datamodel.DorisDBHelper)' on a null object reference