OTA: Fix linux BlockEOF with data length zero (#22309)

Spec indicates BlockEOF May have data length zero.

Author: rgoliver

src/platform/Linux/OTAImageProcessorImpl.cpp

@@ -68,11 +68,6 @@ CHIP_ERROR OTAImageProcessorImpl::ProcessBlock(ByteSpan & block)
         return CHIP_ERROR_INTERNAL;
     }
 
-    if ((block.data() == nullptr) || block.empty())
-    {
-        return CHIP_ERROR_INVALID_ARGUMENT;
-    }
-
     // Store block data for HandleProcessBlock to access
     CHIP_ERROR err = SetBlock(block);
     if (err != CHIP_NO_ERROR)