[TYPO3-mvc] Problem with overwriting $this->settings with values from pluginConfiguration

[Stefan Frömken]

Hello MVC-Team,

my Plugin is configurable with TypoScript:

plugin.tx_plugin {
	settings {
		...many settings
	}
}

and Extbase overwrites these settings with the plugin-flexform which 
also has

settings.xyz

defined.

At the first look of view it works like expected: The value of FlexForm 
overwrites the Value from TS.
BUT: When a value in FlexForm is empty it overwrites the TS-Value, too.

How to solve this problem? All Extbase-methods to read FlexFormValues 
are marked as protected...so I can't access them. piBase is old and I 
don't want to use this in modern extensionprogramming.

The method mergeConfigurationIntoFrameworkConfiguration always calls 
t3lib_div::array_merge_recursive_overrule with the fourth attribute as 
TRUE, so all empty values from Flexform will overwrite the filled values 
from TS.

So...any ideas to prevent from overwriting or do you have another solution?

Stefan