Check that directories exist

src/freedombone-image-mesh

 TOMB_LOG_SIZE_MB=32
 
 # size of the tomb used to store qtox settings
-TOMB_TOX_SIZE_MB=128
+TOMB_TOX_SIZE_MB=32
 
 # Tomb containing tox bootstrap
 TOMB_TOX_BOOTSTRAP_SIZE_MB=10
 
 # Tomb containing zeronet
 TOMB_ZERONET_CONFIG_SIZE_MB=10
-TOMB_ZERONET_DATA_SIZE_MB=512
+TOMB_ZERONET_DATA_SIZE_MB=32
 
 function create_ram_disk {
 	ramdisk_size_mb=$1
 			fi
 		fi
 		ln -s /media/${tomb_name} /var/log
-		cp -rp /var/log_base/* /media/${tomb_name}
+		if [ -d /var/log_base ]; then
+			cp -rp /var/log_base/* /media/${tomb_name}
+		fi
 		echo "${tomb_name} tomb created" >> $INSTALL_LOG
 	else
 		echo "WARNING: ${tomb_name} tomb not found" >> $INSTALL_LOG
 			fi
 		fi
 		ln -s /media/${tomb_name} /var/lib/zeronet
-		cp -rp /var/lib/zeronet_base/* /media/${tomb_name}
+		if [ -d /var/lib/zeronet_base ]; then
+			cp -rp /var/lib/zeronet_base/* /media/${tomb_name}
+		fi
 		echo "${tomb_name} tomb created" >> $INSTALL_LOG
 	else
 		echo "WARNING: ${tomb_name} tomb not found" >> $INSTALL_LOG
 			fi
 		fi
 		ln -s /media/${tomb_name} /var/lib/tox-bootstrapd
-		cp -rp /var/lib/tox-bootstrapd_base/* /media/${tomb_name}
+		if [ -d /var/lib/tox-bootstrapd_base ]; then
+			cp -rp /var/lib/tox-bootstrapd_base/* /media/${tomb_name}
+		fi
 		echo "${tomb_name} tomb created" >> $INSTALL_LOG
 	else
 		echo "WARNING: ${tomb_name} tomb not found" >> $INSTALL_LOG