fixed pipe output sometimes being split on non-existing newlines

src/process.cpp

@@ -706,6 +706,8 @@ void process::on_completed()
 		code_ = 0xffff;
 	}
 
+	read_pipes(false);
+
 	for (;;)
 	{
 		read_pipes(true);

src/process.h

@@ -137,14 +137,17 @@ private:
 			}
 		}
 
-		if (line.empty() && finished)
+		if (line.empty())
 		{
-			line = {
-				reinterpret_cast<const CharT*>(bytes.data() + byte_offset),
-				size - byte_offset
-			};
+			if (finished)
+			{
+				line = {
+					reinterpret_cast<const CharT*>(bytes.data() + byte_offset),
+					size - byte_offset
+				};
 
-			byte_offset = bytes.size();
+				byte_offset = bytes.size();
+			}
 		}
 		else
 		{