Q1: Can this card's On Play When Digivolving effect give 1 on my Digimon Blocker even when my opponent has no Digimon?
Yes, it can.
Lv.4 SymbareAngoramon LM-011 U Champion | Vaccine | Beastkin [On Play] [When Digivolving] Suspend 1 of your opponent's Digimon. Then, if they have no unsuspended Digimon, 1 of your Digimon gains <Blocker> until the end of your opponent's turn. --- Inherited: [Your Turn] While this Digimon has [Angoramon] in its text, it gets +2000 DP.
Lv.4 SymbareAngoramon LM-011 U Champion | Vaccine | Beastkin [On Play] [When Digivolving] Suspend 1 of your opponent's Digimon. Then, if your opponent has no unsuspended Digimon, 1 of your Digimon gains <Blocker> until the end of your opponent's turn. --- Inherited: [Your Turn] While this Digimon has [Angoramon] in its text, it gets +2000 DP.
Lv.4 SymbareAngoramon LM-011 U Champion | Vaccine | Beastkin [On Play] [When Digivolving] Suspend 1 of your opponent's Digimon. Then, if they have no unsuspended Digimon, 1 of your Digimon gains <Blocker> until the end of your opponent's turn. --- Inherited: [Your Turn] While this Digimon has [Angoramon] in its text, it gets +2000 DP.
Lv.4 ジンバーアンゴラモン LM-011 U 成熟期 | ワクチン種 | 獣人型 【登場時】【進化時】相手のデジモン1体をレストさせる。その後、アクティブ状態の相手のデジモンがいないなら、相手のターン終了まで、自分のデジモン1体は≪ブロッカー≫を得る。 --- Inherited: 【自分のターン】このデジモンに「アンゴラモン」の記述がある間、このデジモンをDP+2000。