ANAVI Knobs 3: Fix when running without a display

Handle runtime error if mini I2C OLED display has not been attached
to ANAVI Knobs 3. Fixes:

RuntimeError: No pull up found on SDA or SCL; check your wiring

Signed-off-by: Leon Anavi <leon@anavi.org>

Author: leon-anavi

boards/anavi/knobs3/code.py

@@ -15,14 +15,17 @@
 knob.SCL = board.D5
 knob.SDA = board.D4
 
-display = Display(
-    display=SSD1306(sda=board.D4, scl=board.D5),
-    entries=[
-        TextEntry(text='ANAVI Knobs 3\n\nKMK Firmware'),
-    ],
-    height=64,
-)
-knob.extensions.append(display)
+try:
+    display = Display(
+        display=SSD1306(sda=board.D4, scl=board.D5),
+        entries=[
+            TextEntry(text='ANAVI Knobs 3\n\nKMK Firmware'),
+        ],
+        height=64,
+    )
+    knob.extensions.append(display)
+except RuntimeError as e:
+    print('Mini OLED I2C Display is not available')
 
 knob.matrix = KeysScanner([], value_when_pressed=False)